1. Multiplication & Division
Fractions
Multiplication & Division

2. Multiplication 1 2 x 1 4 = What is happening? 1 2 3 x 1 6 = 1 2 5 x 1
Using a Calculator 1 2 x 1 4 =
What is happening? 1 2 3 x 1 6 = 1 2 5 x 1 10 =

3. It works like this 1 2 5 x 1x1 2x5 = 1 10 = Multiply Numerators
Multiply Denominators

4. Multiplication 3 5 1 2 x 3 10 = Is the same thing happening here? 4 78 35 = 7 9 2 5 x 14 45 =

5. Now try these 3 8 2 x 1 4 = 6 24 = 4 9 3 5 x 4 15 = 12 45 = 5 12 3 10 x 1 8 = 15
120 =
Because the CALCULATOR simplifies fractions automatically

6. Calculator is Cancelling down
Find any number that is a factor of one numerator AND one denominator 3! 1 4 9 3 5 x
4x1
3x5 = 4 15 = 3

7. And again…. 3! 3 8 2 x 1x1 4x1 = 1 4 = 2! Cancelling is quicker 1 1 4
Find any number that is a factor of one numerator AND one denominator
Find another factor of both 3! 1 1 3 8 2 x
1x1
4x1 = 1 4 = 2! 4 1
Cancelling is quicker

8. Division 1 5 2 ÷ 2 5 =
What is happening? 1 7 3 ÷ 3 7 = 1 5 4 ÷ 4 5 =

9. How it works? 1 5 2 ÷ 1 5 = 2 x 1x2 5x1 = 2 5 = 1 7 3 ÷ 1 7 = 3 x 1x34 ÷ 1 5 = 4 x
1x4
5x1 = 4 5 =

10. Division 2 5 1 ÷ 4 5 = Is the same thing happening here? 3 7 4 5 ÷ 1528 = 4 9 3 5 ÷ 20 27 =

11. Now try these 2 5 3 ÷ 3 5 = 3 5 4 ÷ 3 4 = Cancelling again! 4 9 2 3 ÷

12. Division & cancelling = 2 5 3 x = 1 5 3 x 2 5 3 ÷ 1x3 5x1 = 3 5 = 3 54 ÷ = 3 5 4 x = 3 1 4 x
3x1
1x4 = 3 4 = 1 2 1 4 9 2 3 ÷ = 4 9 3 2 x = 2 3 1 x
2x1
3x1 = 2 3 = 3 1

13. Remember how to enter a mixed number?
Mixed numbers
Try the questions without calculators first
Remember how to enter a mixed number?
SHIFT
ab/c