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Multiplying and Dividing Fractions. Can you name the parts of a fraction? ? ? numerator denominator.

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Presentation on theme: "Multiplying and Dividing Fractions. Can you name the parts of a fraction? ? ? numerator denominator."— Presentation transcript:

1 Multiplying and Dividing Fractions

2 Can you name the parts of a fraction? ? ? numerator denominator

3 What sort of fractions / numbers are these: ? ? ? proper fraction improper fraction mixed number

4 2 × 3 6 3 × 4 12 ==

5

6 =

7

8 1.Whole numbers have a denominator of 1. 2.Multiply numerators and denominators. 3.Cancel down and change to a mixed number if necessary.

9

10 1 1 2 5

11 1 3 7 4 Cancelling before multiplication Which is easier?

12 Multiplying always makes things bigger: 2 x 3 = 6 6 is bigger than both 2 and 3 Is he correct?

13

14 = = of means ×

15 = ÷ × 1.Turn the dividing fraction upside down and change ÷ to ×. 2.Multiply numerators and denominators. 3.If necessary cancel down and change to a mixed number.

16 = ÷ × = = = = × × × × ÷ ÷ ÷ ÷

17 =

18

19 1.Whole numbers have a denominator of 1. 2.Turn dividing fraction upside down and multiply numerators and denominators. 3.Cancel down and change to a mixed number if necessary. × ÷

20

21 Division always makes things smaller. If I divide up a rich, tasty chocolate cake, I always get a smaller piece than the whole cake. 12 ÷ 4=3 3 is less than 12 Is she correct?

22

23 ÷ = 6

24 The end


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