A Quick Guide to fractions, decimals and percentages
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1 A Quick Guide to fractions, decimals and percentages The denominator is the number of EQUAL parts. The numerator is the number of those equal parts to which we are referring. Remind children that this is showing 1 out of 4 possible equal parts. FRACTION VOCABULARY equal part numerator simplest form equivalent fractions whole denominator mixed numbers improper fractions fraction integer convert unit fractions Finding a fraction of an amount To find a fraction of an amount we divide the number by the denominator and then multiply our answer by the numerator. Example: 3 8 of 24 = 9 You can think of this as 3 out of every 8 will be shaded: When you add the shaded parts, we have 9. First 24 8 = 3 Then 3 x 3 = 9 So the answer is 9 Changing an improper fraction to a mixed fraction An improper fraction is a top heavy fraction. E.g If a fraction is top heavy it means it is more than one whole. Remember if the numerator is the same as the denominator then the fraction is whole. So, 15 = = 2 whole and 1 This we would write as Changing a mixed fraction to an improper fraction A mixed fraction contains some whole numbers and fractions. E.g Encourage your child to VISUALISE 1/5 2/5 3/5 4/5 5/5 1/5 2/5 How many boxes are shaded? 5/5 in the first bar and 2/5 in the second 7/5 in total. WARNING: it is not out of 10 because of the size of the pieces fifths.
2 To change this into an improper fraction we have to multiply the denominator by the whole number and add the answer so the numerator. So, 1 2 = 1 x 5 = = 7 5 So, 1 2 = Finding equivalent fractions Use a fraction wall to visualise TOP TIP Use a ruler (vertically) on the lines between the equal parts to see where other fractions have the area. e.g. if you put your ruler vertically between 1/3 and 2/3, you will see that the line at the end of 2/6 and 4/12 finishes in the same place. Because these fractions take up the same area as one another, we call them equivalent. Finding equivalent fractions numerically (Hint! Whatever you do to the numerator you must do to the denominator) Equivalent fractions are fractions which have the same value. They are equal. You can make equivalent fractions by multiplying or dividing both the numerator and the denominator by the same amount. You only multiply or divide, never add or subtract, to get an equivalent fraction. Remember to only divide when the numerator and denominator would still be whole numbers. (x2) (x2) E.g. 1 = 2 = (x2) (x2) Simplifying fractions Simplifying fractions means to make the fraction as simple as possible. Sometimes you can divide the top and bottom of a fraction by the same number. This is called simplifying the fraction. You often have to write a fraction in its simplest terms. This means that you have to cancel it down until it cannot be canceled down any more.
3 There are 2 methods for simplifying fractions. Method 1: Divide the numerator and denominator by the greatest common factor. This is the largest number you know that goes exactly into the numerator and denominator. ( 8) E.g. 16 = (Remember these fractions are equivalent!) ( 8) In this example the greatest common factor is 8. So we divide both the numerator and denominator by 8 to get the fraction in its simplest form. Method 2: If you do not know the highest common factor don t panic! You can divide the numerator and the denominator by a number you know will go into both of them exactly and then keep repeating the step until the fraction is in its simplest form. (A good starting point would be your easy times tables 2,3,5,10) Look at this example: ( 5) ( 2) 10 = 2 = ( 5) ( 2) Or Finding a common denominator When ordering fractions or adding them we have to find a common denominator. Common Denominator means that the denominators in two (or more) fractions are common, or the same. There are two methods for this. Method 1: Look at a set of fractions We need to find a common denominator for these fractions. So, we look at the highest denominator which (in this example) is 8. Then we see if the other denominators will all go into 8 without any remainders. In this example they do! So we need to change the other two fractions so that they have 8 as a common denominator as well. Remember the rule: Whatever you do to the denominator you must do to the numerator! (x4) (x2) 1 = 4 1 = (x4) (x2) So the fractions, with the common denominator would be Remember that these fractions still have the same value and are equivalent because we did the same to the denominator as we did to the numerator, therefore their value does not change.
4 Method 2: Look at a set of fractions In this example the biggest denominator is 6. However, the other denominators will not go into 6 without any remainders. So we have to use a different method. This time, we still use the biggest denominator which is 6, but we count up in our 6 x table until we find a number that the other denominators will also go into without remainders. The number will be 30. So we have to change all of the fractions so that their denominators are 30. (x6) (x10) (x5) 2 = 12 1 = 10 3 = , 3 30, 6 30 (x6) (x10) (x5) So our answer would be: Ordering fractions Now that we know how to find a common denominator from a set of fractions, we can also order fractions. For a question like this. Order these fractions into ascending order We need to find the common denominator, which would be 24. Then we need to change the fractions to have 24 as a denominator (x4) (x6) (x3) (x12) 5 = 20 3 = 18 2 = 6 1 = (x4) (x6) (x3) (x12) Remember as these fractions are equivalent (the same value) we can now order them in ascending order. However, we need to remember to write the answer with the fractions that were given to us in the question. So our answer would be and NOT Adding fractions Now that we know how to find a common denominator from a set of fractions, we can also add fractions. REMEMBER WE DO NOT ADD FRACTIONS LIKE THIS!!!! = We have to find the common denominator If we had: We would find the common denominator which would be 12 and change all the fractions to have 12 as a denominator. (x2) (x3) (x4) 1 = 2 3 = 9 1 = (x2) (x3) (x4)
5 Now we can add the fractions as the denominators are the same = 15 or So, = 15 or Hint: Remember we do not add the denominators together as they are all the same value. We are just adding the numerators (all the parts that we have) together. The same principle of finding common denominators can be used to subtract fractions with different denominators. Decimals, Fractions and Percentages are just different ways of showing the same value. They can be converted (changed) to be each other. Before beginning the next section, there are some facts that you need to know. Fraction Decimal Percentage % % % % % Converting a fraction to a percentage A percentage is part of 100. If the fraction is (Something) 100 Then the number on the top is going to be the percentage, as it is that much out of 100. E.g. 40 = 40% 100 However, for all other fractions this is what you do: For example, if we had 4 25 We have to find a number that we can multiply 25 by to make 100, and then we have to multiply the numerator by the same number. (x4) So, 4 = 16 = 16% (x4)
6 Converting a fraction to a decimal To convert a fraction to a decimal we use our place value knowledge to help us. Think of this: T U. t h th tth If a denominator is 10, 100, 1000 you can use you place value knowledge, as you know what 10 th s, 100 th s and 1000 th s are. For example: 3 10 is 3 10 th s and we know (from using the place value chart) that this is 0.3 as a decimal. Similarly to converting a fraction to a percentage, if the denominator was not 10, 100 or 1000 we have to find a number that we can multiply the denominator by to make 100, and then we have to multiply the numerator by the same number. (x4) E.g 4 = 16 = (x4) Converting a percentage into a decimal To convert a percentage to a decimal you divide the percentage by 100. E.g. 68% = = 0.68 Converting a percentage into a fraction To convert a percentage into a fraction, you put the number over 100 (as it is that amount out of 100) and then simplify the fraction if you can. ( 5) E.g. 65% = 65 = ( 5) Converting a decimal into a fraction To convert a decimal you have to again use place value to help you. First of all look at the decimal. If the numbers in the decimal goes up to the 10 th s column then the answer is going to be that number over 10. E.g. 0.8 = 8 10 If the numbers in the decimal goes up to the 100 th s column then the answer is going to be that number over 100. ( 5) E.g = 85 = ( 5)
7 If the numbers in the decimal goes up to the 1000 th s column then the answer is going to be that number over ( 2) ( 2) ( 2) E.g = 848 = 424 = 212 = ( 2) ( 2) ( 2) Converting a decimal into a percentage To convert a decimal into a percentage you multiply the number by 100 and that is the percentage. E.g = = 32 = 32% You can also have an example like this: = = 62.5 = 62.5% Find a percentage of an amount Quick tips to find percentages of amounts. If you are finding 10% you divide the number by 10. This is because 100% is the whole thing and you only want to find 10 of those percents, so you are dividing the number into 10 parts. E.g Find 10% of = 65 So, 10% of 650 = 65 If you are finding 1% you divide the number by 100. This is because 100% is the whole thing and you want to find just 1 of those percents, so you are dividing the number into 100 parts. E.g Find 1% of = 0.73 So, 1% of 73 = 0.73 Finding a Percentage of Any Number by Using the Bubble Method To find a percentage of any number: Fill in the value of each circle, beginning with the main number in the shaded area. Work your way through all 6 circles by following the actions on each arrow. Next, to find 30% of 800. Find percentage values that add up to the total you are looking for e.g. 25% + 5% = 30% Then add up the values of those circles e.g = 240 This means that 30% of 800 = 240
8 Now that you know all of these facts you can work out any percentage of an amount. To find 5%, you can find 10% and then half it To find 20% you can find 10% and double it To find 30% you can find 10% and multiply it by 3 To find 40% you can find 10% and multiply it by 4 To find 60% you can find 50% and 10% and add the answers together To find 3% you can find 1% and multiply it by 3 To find 0.5% you can find 1% and half it. Etc etc So the GOLDEN RULES FOR SUPPORTING YOUR CHILD: 1) Be positive! Don t ever proudly declare that you were bad at maths. 2) Encourage the use of diagrams, drawings, jottings when they are working the more they can see fractions, the better understanding they will have! 3) Reinforce what the numerator and denominator are, using questions like, How many equal parts would be in the whole?, Does your numerator tell you that you have more or less than half? 4) It s not all about the pizza! Apply fractions to other things if you want to reinforce the concept number lines, areas, fraction strips and real life examples such as ½ teaspoon in a recipe or ½ pint of milk. 5) The concept of fractions is a complex one and it takes time so don t try to rush ahead. 6) If you are in any doubt, please ask your teacher for extra support, examples and ideas.
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