# Using Proportions to Solve Percentage Problems I

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1 RP7-1 Using Proportions to Solve Percentage Problems I Pages Standards: 7.RP.A. Goals: Students will write equivalent statements for proportions by keeping track of the part and the whole, and by solving easy proportions. Prior Knowledge Required: Can write equivalent ratios Can name a ratio from a picture Vocabulary: comparison fraction, equivalent ratios, multiplier, part-to-whole ratio, percent, proportion, ratio Materials: BLM Three Types of Percentage Problems (p. N-79) Using pictures to review equivalent ratios. Draw on the board: Have students brainstorm ways of interpreting this picture. SAY: The picture shows four equivalent statements. Write on the board: 6 of the circles are shaded. 9 of the circles are shaded. 6 is of 9 6 : 9 : Exercises: Write four equivalent statements for the picture. a) b) Answers: a) 6/8 are shaded, /4 are shaded, 6 is /4 of 8, 6 : 8 : 4; b) 8/1 are shaded, / are shaded, 8 is / of 1, 8 : 1 : Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-5

2 Writing part-to-whole as a ratio. Tell students that they can write different part-to-whole ratios from the same picture. Draw on the board: ASK: How many circles are there? (9) How many are shaded? () Write on the board: part : whole : 9 ASK: How many groups are there? () How many groups are shaded? (1) Write on the board: part : whole 1 : Exercises: Write a pair of equivalent ratios for the picture. a) b) Answers: a) part : whole 4 : 10 : 5, b) part : whole 9 : 1 : 4. Writing part-to-whole as a fraction. Tell students that they can write different fractions of the part form from the same picture. Draw on the board: whole ASK: How many circles are there? (1) How many are shaded? () Write on the board: part whole 1 Point to the fraction /1 and SAY: The comparison fraction is /1. ASK: How many groups are there? (4) How many groups are shaded? (1) Write on the board: part 1 whole 4 Point to the fraction 1/4 and SAY: The comparison fraction is 1/4. Exercises: 1. Write a pair of equivalent fractions for each picture from the previous set of exercises. Answers: a) part/whole 4/10 /5, b) part/whole 9/1 /4 N-6 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

3 . Determine the part, the whole, and the comparison fraction. Write an equivalent fraction. a) is 1 4 of 1 b) 4 is of 6 c) 6 is of 10 5 Answers: a) part, whole 1, comparison fraction 1/4, part/whole /1 1/4; b) part 4, whole 6, comparison fraction /, part/whole 4/6 /; c) part 6, whole 10, comparison fraction /5, part/whole 6/10 /5 Writing ratios with missing parts. Tell students that in the previous exercises, all four numbers in the equivalent ratios or fractions were given. Usually in questions like those, one number (out of four) is missing. Explain to students that to write a proportion, they have to determine the part, the whole, and what fraction or ratio of the whole the part is, then write them in the correct places. Write on the board: 8 is of what number? SAY: In this question, the part is 8 and the whole is missing. ASK: What is the comparison fraction? (/) What is the ratio of part-to-whole? ( : ) Write on the board: 8 :? :, part 8 whole? Emphasize that writing each number in the correct place is very important, because writing a number in the wrong place leads to a wrong answer. Exercises: Determine the part, the whole, and the comparison fraction. Write the proportion, but replace the missing number with a question mark. a) is 1 of what number? b) 4 is 1 of what number? c) 6 is 5 of what number? d) What number is 4 e) What number is 4 5 of 0? f) What number is 7 of 0? of 1? Answers: a) part, whole?, comparison fraction 1/, so 1/ /?; b) part 4, whole?, comparison fraction 1/, so 1/ 4/?; c) part 6, whole?, comparison fraction /5, so /5 6/?; d) part?, whole 0, comparison fraction /4, so /4?/0; e) part?, whole 0, comparison fraction 4/5, so 4/5?/0; f) part?, whole 1, comparison fraction /7, so /7?/1 Changing a verbal proportion problem into a known problem. Write on the board: 1 is how many fifths of 0? Underline how many fifths and point out that this is the same as?/5. SAY: The denominator tells you that the size of the parts is a fifth, and the numerator the unknown tells you the Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-7

4 number of fifths. So 1 is how many fifths of 0 is another way of saying 1 is?/5 of 0. This is now easy to change to an equivalent ratio. Write on the board:? : 5 1 : 0 Exercises: Write an equivalent ratio for the question. Then write the fraction form. a) 8 is how many thirds of 1? b) 1 is how many quarters of 8? c) 18 is how many tenths of 0? Answers: a)? : 8 : 1,?/ 8/1; b)? : 4 1 : 8,?/4 1/8; c)? : : 0,?/10 18/0 Writing percentage statements in terms of ratios. Remind students that asking how many hundredths is like asking for?/100. ASK: What is another name for a fraction with denominator 100? PROMPT: What do we use to compare numbers to 100? (a percent) Since students can write fraction statements as equivalent ratios, and a percentage is just a fraction with denominator 100, students can now write percentage statements as equivalent ratios. Exercises: Write the proportion (without solving it). Then write the proportion in terms of fractions. Replace the missing number with a question mark. a) 19 is how many hundredths of 0? b) 1 is how many hundredths of 50? c) 6 is how many hundredths of 60? Answers: a)? : : 0,?/100 19/0; b)? : : 50,?/100 1/50; c)? : : 60,?/100 6/60 Remind students that a percentage is a hundredth, so asking what is 15% of 40 is asking what is 15 hundredths of 40. If they know how to find a fraction of a whole number, then they know how to find a percentage of a whole number. In questions in which the percentage is unknown, students can write a comparison fraction with denominator 100 and a question mark in the numerator. Exercises: Write the question as a proportion, in ratio form and in fraction form. a) What is 15% of 40? b) What is % of 50? c) What is 75% of 48? d) 4 is 80% of what number? e) 6 is 5% of what number? f) 1 is 0% of what number? g) What percent of 0 is 19? h) What percent of 4 is 6? Answers: a)? : : 100, or?/40 15/100; b)? : 50 : 100, or?/50 /100; c)? : : 100, or?/48 75/100; d) 4 :? 80 : 100, or 4/? 80/100; e) 6 :? 5 : 100, or 6/? 5/100; f) 1 :? 0 : 100, or 1/? 0/100; g) 19 : 0? : 100, or 19/0?/100; h) 6 : 4? : 100, or 6/4?/100 Distribute BLM Three Types of Percentage Problems. All three types of questions from the exercises above are summarized on the BLM. Students can use BLM Three Types of Percentage Problems as a reference to help them solve the remaining exercises in this lesson. N-8 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

5 Solving proportions. Show students how to solve proportions using equivalent ratios. Use this problem: If 4 bus tickets cost \$9, how much would 1 tickets cost? Step 1: Make the proportion. Write a fraction on the board, the top of which is the unknown quantity (in this example, Dollars) and the bottom of which is the other quantity (in this example, Tickets). Write on the board the complete ratio of dollars to bus tickets (9 : 4) in fraction form, then write the incomplete ratio of dollars to bus tickets (? : 1) in fraction form, as shown below: Dollars 9? Tickets 4 1 Step : Find the multiplier. Find the number the first denominator is being multiplied by to get the second denominator (in this example, ). Write on the board: 9 4? 1 Step : Find the missing number. Multiply the numerator by that multiplier to find the missing number, as shown below: SAY: Since 9/4 7/1, 1 tickets cost \$7. Have volunteers complete the first few exercises below, then have students answer the rest on their own. Exercises: a) If bus tickets cost \$4, how much will 15 bus tickets cost? b) Five bus tickets cost \$6. How many can you buy with \$0? c) On a map, cm represents 10 km. How many kilometers do 15 cm represent? d) Milly gets paid \$5 for hours of work. How much would she get paid for working 6 hours? e) Three centimeters on a map represents 0 km in real life. If a lake is 6 cm long on the map, what is its actual length? f) There are apples in a bowl for every oranges. If there are 1 oranges, how many apples are there? Bonus: A goalie stopped 18 out of every 19 shots. There were 8 shots. How many goals were scored? Hint: How many did she not stop? Answers: a) \$0, b) 5, c) 50 km, d) \$50, e) 40 km, f) 8, Bonus: Extensions 1. Determine decimals as the value of a percentage. a) What percent of 0 is 16.5? b) What percent of 18 is.7? c) What percent of 14 is.8? Answers: a) 55%, b) 15%, c) 0% Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-9

6 . Give word problems involving decimals as the value of a percentage. a) A book that costs \$18 came to \$0.70 after taxes. i) How much were the taxes? ii) What percent is the tax? b) The regular price of a book is \$18. The sale price is \$1.60. i) How much was taken off the regular price? ii) What percent was taken off the regular price? Answers: a) i) \$.70, ii) 15%; b) i) \$5.40, ii) 0% N-40 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

7 RP7- Using Proportions to Solve Percentage Problems II Pages Standards: 7.RP.A. Goals: Students will write equivalent statements for proportions by keeping track of the part and the whole, and by solving the proportions. Prior Knowledge Required: Can write equivalent ratios Can solve proportions Vocabulary: equivalent ratios, lowest terms, multiplier, percent, proportion, ratio Materials: calculators BLM Three Types of Percentage Problems (p. N-79) NOTE: Students can use BLM Three Types of Percentage Problems as a reference to help them solve the exercises in this lesson. Review percentage proportions in terms of fractions. Remind students that to write a proportion, they have to determine the part, the whole, and what fraction of the whole is the part. SAY: Suppose that we want to find what percent of 5 is 7. ASK: What is the whole in this question? (5) What is the part? (7) ASK: What is the part-to-whole fraction? (7/5) SAY: There is another way of writing the part-to-whole, which is the missing percent/100 or?/100, so we can equate the two part-to-whole ratios. Write on the board: part 7? whole Emphasize that writing each number in the correct place is very important, because writing a number in the wrong place leads to a wrong answer. Remind students that writing part-to-whole ratios is the first step of solving proportions. In the second step, they have to find the relation between two given numerators or denominators. In this example, students have to find the number the first denominator is being multiplied by to get the second denominator. Write on the board: 7 5 4? 100 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-41

8 In the third step, students have to multiply the numerator by that multiplier to find the missing number, as shown below: Exercises: Write the proportion in fraction form, then solve the proportion. a) What percent of 0 is 9? b) What is 50% of 50? c) 9 is what percent of 5? d) 1 is 6% of what number? Answers: a) 9/0?/100, so 9 is 45% of 0; b)?/50 50/100, so 5 is 50% of 50; c) 9/5?/100, so 9 is 6% of 5; d) 1/? 6/100, so 1 is 6% of 50 (MP.1) Solving proportions that need simplifying. Write on the board: 9? Explain to students this proportion is easy to solve because the relationship between the two denominators is obvious. SAY: You can find the second denominator by multiplying the first denominator by 5. You find the multiplier by dividing 100 by 0. Write on the board: 7? SAY: In this proportion, the relation between two denominators is not clear. Ask students to use their calculators to divide 100 by 5 to find the multiplier. ASK: Is the answer a well-known decimal? (no) SAY: Don t give up! Try to reduce 7/5 to lowest terms. Write on the board: SAY: Replace 7/5 by 1/5. Write on the board: 1? ASK: Is this proportion easy to solve? (yes) Ask a volunteer to solve the proportion as shown below: , so N-4 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

9 Exercises: Find an equivalent ratio to rewrite the proportion. Solve the new proportion.? 11 6? 1 40 a) b) c) ? 100? 4? 75 d) e) f) 1? Answers: a)?/100 1/, so? 50; b) 1/4?/100, so? 5; c) 1/? /5, so? 0; d)?/100 /4, so? 75; e)?/48 /4, so? 6; f) 1/5?/100, so? 0 Word problem practice. Exercises: Use your answer to each problem to obtain the answer to the next problem. Discuss the similarities and differences between the problems. a) 1 is how many fifths of 0? b) How many fifths of 0 is 1? c) 1 is what percent of 0? d) What percent of 0 is 1? e) A shirt costs \$0, and \$1 was taken off. What percent was taken off? Answers: a), b), c) 40, d) 40, e) 40 Selected solutions: a) 1/0?/5, so? ; b)?/5 1/0, so? ; c) 1/0?/100, so? 40. The difference between a) and b) is just the order of fractions, but in c) the question asks for percentage so the denominator is 100. Finding the whole from the part. Write on the board: of a number is 100. What is the number? ASK: Is 100 the part or the whole? (the part) What is the whole? (the number that we don t know) Tell students that this is a part-to-whole ratio. Write on the board: 100 part? whole Have students solve the proportion. (? 150) Exercises: Write the proportion, then find the number. a) of a number is 9 4 b) 4 9 of a number is 4 c) 7 of a number is 1 1 Answers: a) /4 9/?, so the number is 1; b) 4/9 4/?, so the number is 54; c) 7/1 1/?, so the number is 9 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-4

13 improper fraction. We cannot write 1,00 ( 1/) 1,00 ( + 1/) 1,00 + 1,00 1/, because the distributive law does not apply here. If you try to use the distribute law, you should see right away that doing so gives an answer that can t be correct: 1,00 is larger than what you started with, 1,00 ( 1/), because is less than 1/ and dividing by a smaller number gives a larger result of the people (boys, girls, adults) at the park are boys. There are more girls than boys. There are 7 adults. How many people are at the park? Solution: boys girls adults From the model, it is clear that 1/5 of the total number of people is 10. 1/5 of 50 is 10, so there are 50 people at the park. Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-47

14 RP7- Solving Equations (Introduction) Pages 51 5 Standards: preparation for 7.EE.B.4 Goals: Students will use the balance model to solve addition and multiplication equations including negative addends and coefficients. Prior Knowledge Required: Is familiar with balances Can solve a simple equation to find an unknown value Can substitute numbers for unknowns in an expression Can check whether a number solves an equation Vocabulary: balance, equation, expression, integer, pan balance, quotient, sides (of an equation), variable Materials: pan balance apples, cubes, or other small objects for demonstration paper bags, several for display masking tape 40 connecting cubes for demonstrations NOTE: You will need a number of identical objects for demonstrations throughout this lesson. The objects you use should be significantly heavier than a paper bag, so that the presence of a paper bag on one of the pans of the balance does not skew the pans. Apples are used in the lesson plan below (to match the pictures in the AP Book), but other objects, like small fruit of equal size, metal spoons, golf balls, tennis balls, or cereal bars, will work well. If a pan balance is not available, refer to a concrete model, such as a seesaw, to explain how a pan balance works, and use pictures or other concrete models during the lesson. Review pan balances. Show students a pan balance. Place the same number of identical (or nearly identical) apples on both pans, and show that the pans balance. Remind students that when the pans, or scales, are balanced, this means there is the same number of apples on each pan. Removing the same number of apples from both pans keeps them balanced. Place some apples in a paper bag and place it on one pan, then add some apples beside the bag. Place the same total number of apples on the other pan. ASK: Are the pans balanced? (yes) What does this mean? (the same number of apples are on each pan) Take one apple off each pan. ASK: Are the pans still balanced? Repeat with two apples. Remove the same number of apples from each pan until one pan has only the bag with apples on it. ASK: Are the pans balanced? N-48 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

16 ASK: How many apples are left on the right side of the equation? (5) What letter did we use to represent how many apples are in the bag? (x) Remind students that we write this as x 5. Solving addition equations without using the balance model. Present a few equations without a corresponding model. Have students signal how many apples need to be subtracted from both sides of the equation, then write the vertical subtraction for both sides. Exercises: Solve the equation. a) x b) n + 17 c) 14 + n 17 d) p Answers: a) x 4, b) n 6, c) n, d) p 6 Students who have trouble deciding how many apples to subtract without the model can complete the following problems. Exercises: Write the missing number. Part a) has been done for you. a) x + 15 b) x + 55 c) x + 91 Bonus: x x x x 8 Answers: b) 55, c) 91, Bonus: x Finally, give students a few more equations and have them work through the whole process of subtracting the same number from both sides to find the unknown number. Exercises: Solve the equation by subtracting the same number from both sides to find the unknown number. a) x b) x c) + x 5 d) x Sample solution: a) x x 9 Bonus: The scale below is balanced. Each bag has the same number of apples in it. How many apples are in the bag? Hint: You can cross out whole bags too! Answers: b) 1, c), d) 6, Bonus: Solving multiplication equations given by a model. Divide a desk into two parts using masking tape and place three bags (with 4 cubes in each) on one side of the line, and 1 separate cubes on the other side of the line. Tell students that the pans are balanced. ASK: What does this say about the number of cubes in both pans? (they are equal) How many cubes are on the pan without the bags? (1) How many cubes are in the bags in N-50 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

18 Multiplying and dividing by the same number does not change the starting number. Write on the board: (5 ) ( ) (8 ) (5 4) 4 (9 ) (10 6) 6 Have students solve each question. (5,, 8, 5, 9, 10) SAY: Look at the questions you solved. ASK: How are they all the same? (they start with a number, multiply by another number, then divide by the same number) Did you get back to the same number you started with? (yes) Does it matter what number you started with? Does it matter what number you multiplied and divided by as long as it was the same number? (no) Have students write their own question of the same type, and check that they get back to the same number they started with. Explain that you can do the same with unknown numbers. Show one paper bag with some cubes and SAY: I want to multiply this by. ASK: What will the answer look like? ( bags) SAY: I want to divide the result by. What will you get? (1 bag again) Write on the board: ( ) ASK: What will we get when we perform the multiplication and the division? (the box) Write on the board: (b ) (b 5) 5 (b 6) 6 (b 10) 10 Have students solve each question. (, 5, 6, 10) Solving equations by dividing both sides by the same number. Write on the board: (b 7) b (b ) b (b 4) b (b 8) b (b 1) b (b 9) b For each equation, have students hold up the correct number of fingers to signal the number they would divide the product by to get back to b. (7,, 4, 8, 1, 9) If a pan balance is available, show students the balance with bags of 5 apples (other objects will work equally well cereal bars, metal spoons, etc.) on one pan, and 15 apples on the other pan. Invite a volunteer to write the equation for the balance on the board, as shown below: 5 15 ASK: How many apples are in one bag? (5) Have a volunteer make three groups of five apples on the side without the bags. Point out that there are three equal groups of apples on both sides of the balance. Remove two of the bags from one side, and two of the groups from the other side. SAY: I have replaced three equal groups on each side with only one of these groups. N-5 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

21 Extension (MP.5) a) Does the model work to solve the equation? i) x + 8 ii) x 8 iii) x 1 iv) x 1 v) 0.6x 1.8 b) Does doing the same thing to both sides work? Answers: a) i) yes, ii) no, iii) yes, iv) no, v) no; b) i) yes, ii) yes, iii) yes, iv) yes, v) yes Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-55

22 RP7-4 Cross Multiplication (Introduction) Pages Standards: 7.RP.A. Goals: Students will cross multiply to write an equation for problems involving proportions. Prior Knowledge Required: Can convert a fraction a/b to a decimal by dividing a b Can find equivalent fractions by multiplying the numerator and denominator by the same number Can write an equivalent multiplication statement for a given division statement Vocabulary: canceling, commutative property, complex fraction, cross multiply, equivalent fractions Materials: calculators Review writing a fraction as a division statement. Remind students that we can calculate the value of a fraction such as /4 by dividing 4. For a quick reminder of why this is true, SAY: To find 1/4 of something, I would divide it into four equal groups. So to find 1/4 of something, divide it by 4. You can think of 1/4 as 1/4 of 1, so that is 1 4. But /4 is three times as much as 1/4, so /4 is Exercises: Write as a division statement and use a calculator to find the answer. a) b) 5 c) 7 d) e) Answers: a) 5 0.6, b) , c) , d) 10 0., e) Writing fraction statements as equivalent multiplication statements. Remind students that a division statement can be written as a multiplication statement. For example, 1 4 can be rewritten as 1 4. Exercises: Change the division statements in the previous set of exercises to multiplication statements. Answers: a) 5 0.6, b) , c) , d) 10 0., e) To guide students in the following exercises, write this template on the board: so N-56 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

23 Exercises: Change the fraction statement to a division statement, then to a multiplication statement. a) b) c) d) Answers: a) , so ; b) , so ; c) , so ; d) ; so Finding a pattern. Now have students look at their answers to the questions in the previous set of exercises. ASK: If we know the value of a fraction as a decimal, how can we use that to write a multiplication statement? Write on the board: ASK: In which blank does the numerator the top number of the fraction go? (the first blank) What number goes in the second blank, the denominator or the value? (it doesn t matter, because multiplication follows the commutative property) Explain that when you know the decimal value of a fraction, the numerator of the fraction can be written as the product of the denominator and the decimal value. Exercises: 1. Write the fraction as a product. a) b) c) d) Answers: a) , b) , c) , d) Calculate the value of the fraction, then write a multiplication statement. a) b) 9 c) 1 d) Bonus: e) f) Answers: a) 0.4 5, b) , c) , d) , Bonus: e) 4.6 5, f) Writing fraction statements that involve variables as a product. Write on the board: 10 x SAY: I don t know what number x is, but I know that whatever it is, times x is equal to 10. Write on the board: 10 x, so x 10 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-57

24 Exercises: Rewrite the equation so that it uses multiplication instead of division. a) 4 x b) 4 x c) 4 4 x d) x 5 x x e) 5 f) g) 8 x h) 15 x i) 18 x j) 18 x k) x x l) 15 Answers: a) 4 x, b) 4 x, c) 4 4x, d) x 5, e) x 5 6, f) x 8 7, g) 8 x, h) 15 x, i) 18 x, j) 18 x, k) x, l) x 15 Changing an equation of equivalent fractions to an equation of multiplication statements. Write on the board: SAY: I can write each fraction as a division statement. Write on the board: Have students verify this equation by doing long division. ( and ) Tell students that you find it easier to work with multiplication than with division. SAY: I would like to be able to verify this equality by using multiplication instead of division, and I know a trick that lets me change the equation so I can do that. Work through the steps below as a class. Write on the board: SAY: Start by multiplying both sides by 5 0 (the product of the denominators). Write on the board: SAY: Then, cancel common factors and rewrite the equation. The equations should look like this: Point out that we have now created an equation of multiplication statements instead of fractions. Have students use multiplication to verify the equation. ASK: Was it easier to use multiplication to verify the equation or was it easier to use division? (multiplication) Have students use this method to complete the following exercises. N-58 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

25 Exercises: Change the equivalent fractions to equivalent multiplication statements. a) 8 b) 6 c) 5 10 d) Answers: a) 1 8, b) , c) , d) Multiplying to verify equivalent fractions. Point out that the fractions /5 and 1/0 are equivalent fractions. ASK: How do I know? PROMPT: What number can we multiply both the numerator and the denominator by in /5 to get 1/0? (multiply by 4 to get 1 and 5 by 4 to get 0) Write on the board: ASK: How can we change this to an equation with multiplication instead? (we did it above it was 0 1 5) Exercises: Change the equivalent fractions to equivalent multiplication statements. a) b) c) 7 1 d) Sample solution: a) /4 15/0 / / Answers: b) , c) , d) (MP.8) Finding a pattern (cross multiplying). Have students look at their answers to the previous set of exercises. ASK: How can you find which numbers to multiply together from the fractions? PROMPT: Do you multiply both numerators together? (no) What do you multiply together? (the numerator of one fraction with the denominator of the other fraction) Go through each one, point to the answer, and verify that this is indeed what students did for each question join the numerator of each fraction with the denominator of the other fraction to emphasize this point. Tell students that because the products from equivalent fractions can be found by drawing an X, we call this process cross multiplying. Write on the board: Exercises: 1. Verify that each pair of fractions in the previous two sets of exercises are in fact equivalent by verifying that the products you found are equal. Answers: a) 1 8 b) c) d) a) b) c) d) Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-59

26 (MP.7). Use cross multiplication to verify that the fractions are equivalent. a) 6 b) 4 1 c) Bonus: Answers: a) 14 4 and 6 7 4; b) and ; c) and ; Bonus: ,19 and 1 4,19 (MP.7) Cross multiply to identify equivalent fractions. For the following exercises, have students decide whether the two fractions are equivalent by multiplying the numerator of each fraction with the denominator of the other fraction and checking whether the two products are equal. Exercises: Cross multiply to check if the fractions are equivalent. a) 8 64 and b) 7 49 and c) 6 and d) 4 6 and e) and f) and g) 7 6 and Bonus: and Answers: a) not equivalent, b) equivalent, c) not equivalent, d) not equivalent, e) not equivalent, f) equivalent, g) equivalent, Bonus: not equivalent Cross multiplying for complex fractions. SAY: You can cross multiply complex fractions, too. Explain that complex fractions are like other fractions they just contain fractions in the numerator, or the denominator, or both. Write on the board: 4 5 and SAY: To verify that they are equivalent, I have to multiply the numerator of the first complex fraction by the denominator of the second complex fraction, then the numerator of the second complex fraction by the denominator of the first complex fraction. Write on the board: and ASK: Are they equal? (yes) Students can answer by signaling thumbs up. ASK: How do you know? (because 4/1 and 1/ are equivalent fractions) SAY: So the two complex fractions are equivalent. Exercises: Cross multiply to check if the complex fractions are equivalent. 6 1 a) 4 and 4 b) 5 and Answers: a) equivalent, b) not equivalent N-60 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

27 Explain that when the relation between two numerators or two denominators is clear and easy to find, they can find the missing number mentally. Otherwise, it is better to use cross multiplication. Exercises: How would you solve the proportion: mentally or using cross multiplication? Circle the questions you would solve mentally. a) 6 b) 5? c) 5? ? d) 55? e) f) ? 65? Answers: a) mentally,? 10; b) cross multiplying,? 1.5; c) cross multiplying,?.5; d) mentally,? 11; e) mentally,? 7.7; f) cross multiplying,?.5 Extensions 1. a) Have students investigate this question: If fractions 5 and 6 10 is equivalent to? Write on the board: 6 are equivalent, what fraction 6 Cross multiply to get Have students decide what fractions they can cross multiply to get Suggest that students look for where the parts of each fraction go in the equation and compare how the equations are different. PROMPT: Which numbers switched positions, and which numbers stayed in the same position? b) Have students cross multiply to make a new pair of equivalent fractions, then use the commutative property of multiplication for one of the products (not both!) to make a new pair of equivalent fractions. i) 6, so ii) 1 5, so iii) 9, so Answers: a) and 10 are in the same position, but 5 and 6 get switched. So the corresponding fractions are 5 ; b) i) /6 /9, ii) 1/5 4/0, iii) /9 5/15. Emphasize to students that to 6 10 find the second pair of equivalent fractions, they can read the numbers from the first pair across, from left to right.. Mental math and estimation. Tell students that you know someone who changed the fractions in Extension 1, part b.ii) to 1/0 5/4. ASK: How can you tell immediately that this is wrong? Answer: 1/0 is less than 1, but 5/4 is more than 1. Cross multiplying with decimal numbers. Cross multiply to verify whether the fractions are equivalent. a) and b) and Sample solution: a) , Answers: b) no, c) no c) and Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-61

28 RP7-5 Using Equations to Solve Proportions Pages Standards: 7.RP.A. Goals: Students will cross multiply to solve problems that involve proportions. Prior Knowledge Required: Can convert a fraction a/b to a decimal by dividing a b Can find equivalent fractions by multiplying the numerator and denominator by the same number Can write a proportion to solve ratio and percentage problems Can solve multiplicative equations Can write an equivalent multiplication statement for a given division statement Vocabulary: cross multiply, equation, equivalent fractions, equivalent ratios, percent, proportion, variable Materials: calculators Using cross multiplying to write equations. Show students how to cross multiply to write an equation when there is a variable in one of the fractions. Write on the board: 10 x SAY: I don t know what number x is, but I know that no matter what, times x is equal to 10 times. Write on the board: x, so 0 x x Exercises: Cross multiply to write an equation for x. a) 4 x 5 b) 4 x 5 c) 4 4 x 5 d) x 1 9 x 5 x 8 8 x e) f) g) h) 15 x Answers: a) 4 5 x, so 10 x; b) 10 x, c) 10 4x, d) 9x 6, e) x 0, f) 8x 56, g) 40 x, h) 60 x Using cross multiplying to solve equations. Review multiplicative equations like b 1. Remind students that to solve this type of equation, they have to divide both sides of the equation by the coefficient of the unknown. For example, in the equation b 1, the answer is b 1, so b 6. N-6 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

29 Exercises: 1. Have students solve the equations in their answers to the previous set of exercises. Sample solution: d) 9x 1, 9x 6, x 6 9, x 4 Answers: a) x 60, b) x 40, c) x 0, e) x 10, f) x, g) x 0, h) x 0. Rewrite the equation so that it involves multiplication, then solve for x. Check your answer by substitution. a) 0 5 x b) x c) x d) x e) x f) x 8 Answers: a) 0 5x, so x 0 5 4; b) x 6 7 4; c) x 6, so x 6 1; d) 60 15x, so x ; e) x 7 9 6; f) 48 8x, so x Point out that parts c) and f) do not even need to be rewritten, as they can be solved in one step. For example, c) says directly that 6 x, so we don t need to first write that x 6. Cross multiplying when the answers are decimal numbers. Tell students to again cross multiply to solve for x, but this time their answers will be decimal numbers. This means that they are comparing equivalent ratios rather than equivalent fractions. Remind students that we can write ratios in fraction form even when both terms are not whole numbers. Review writing fractions as decimal fractions, then as decimals. Write on the board: , 1 0.5, , 4 0.4, 6 0.6, Exercises: Solve for x. a) 10 x 5 7 x b) c) d) 7 4 x x 5 e) 9 6 x 5 f) 5 11 x Sample solution: c) 5x 4, so x 4 5 4/5 8 /5, so x 8.4 Answers: a) 10x 9, so x 0.9; b) 6x 15, so x.5; d) 4x 5, so x 8.75; e) 6x 45, so x 7.5; f) 5x, so x 6.6 Using proportions to solve percentage problems. Review writing a proportion to solve a percentage problem, then demonstrate how using cross multiplication makes the problem easy. Write on the board: What is 0% of 8? SAY: Suppose the answer is x and we re going to find x. If 0% of 8 is equal to x, the ratio of x to 8 is the same as the ratio of 0 to 100. Write on the board: x : 8 0 : 100 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships N-6

30 SAY: To solve this proportion, you can write it as two equivalent fractions. Write on the board: x : 8 0 : 100 x Remind students that they already used cross multiplying to solve this type of equation. Ask a volunteer to solve the equation, as shown below. x 0, so 100x x 40 x x.4 Explain to students that writing the proportion is the most important part of the solving process. Write on the board: 1 is % of what number? SAY: Suppose the answer is x and we re going to find x. Have students propose different ways of writing the proportion for this problem. SAY: Because there is % in the question, one fraction in the proportion is /100. Write on the board: x x 100 ASK: Which proportion gives me the answer, the first or the second? (the second) Students can answer by signaling thumbs up or thumbs down as you point to each proportion. ASK: How do you know? (because 1 is a part of the question and is in the numerator of the second proportion) Ask a volunteer to use cross multiplying to solve the proportion, as shown below. 1, so x x 100 x 1,00 x 1,00 x 400 Exercises: Write a proportion in fraction form, then cross multiply and solve. a) What is 15% of 40? b) What is % of 50? c) What is 75% of 48? d) 4 is 80% of what number? e) 6 is 5% of what number? f) 1 is 0% of what number? Answers: a) x/40 15/100, x 6; b) x/50 /100, x 16; c) x/48 75/100, x 6; d) 4/x 80/100, x 0; e) 6/x 5/100, x 48; f) 1/x 0/100, x 40 N-64 Teacher s Guide for AP Book 7. Unit Ratios and Proportional Relationships

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### Sample worksheet from

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