This document provides instructions for adding, subtracting, multiplying, and dividing fractions. It explains that to add or subtract fractions, they must have a common denominator. To multiply fractions, multiply the numerators and denominators. To divide fractions, flip the second fraction and multiply instead of divide. It also discusses getting common denominators by finding a lowest common multiple of the denominators.

1. FRACTIONS This presentation will help you to add, subtract, multiply and divide fractions. Left click on the mouse to reveal the next section

2. To learn about: Adding fractions click Subtracting fractions click Dividing fractions click Multiplying fractions click

3. Adding fractions To add fractions together the denominator (the bottom bit) must be the same. Example

4. Now try these Click on the mouse to reveal the answers. 1 . 2 . 3 . 4 .

5. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example

6. Now try these Click on the mouse to reveal the answers. 1 . 2 . 3 . 4 .

7. Multiplying fractions To multiply fractions we multiply the tops and multiply the bottoms Top x Top Bottom x Bottom

8. Multiplying fractions Example

9. Now try these Click on the mouse to reveal the answers. 1 . 2 . 3 . 4 .

10. Dividing fractions Once you know a simple trick, dividing is as easy as multiplying! Turn the second fraction upside down Change the divide to multiply Then multiply!

11. Dividing fractions Turn the second fraction upside down Example Change the divide into a multiply Then multiply

12. Now try these Click on the mouse to reveal the answers. 1 . 2 . 3 . 4 .

13. Common denominators To add or subtract fractions together the denominator (the bottom bit) must be the same. So, sometimes we have to change the bottoms to make them the same. In “maths-speak” we say we must get common denominators

14. Common denominators To get a common denominator we have to: 1. Multiply the bottoms together. 2. Then multiply the top bit by the correct number to get an equivalent fraction

15. Common denominators For example Multiply the bottoms together

16. Common denominators For example 2. Write the two fractions as sixths

17. Common denominators For example To get ½ into sixths we have multiplied the bottom (2) by 3. To get an equivalent fraction we need to multiply the top by 3 also

18. Common denominators For example To get 1/3 into sixths we have multiplied the bottom (3) by 2. To get an equivalent fraction we need to multiply the top by 2 also

19. Common denominators For example We can now rewrite

20. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply

21. Now try these Click on the mouse to reveal the answers. 1 . 2 . 3 . 4 .

22. For further info Go to: BBC Bitesize Maths Revision site by clicking here: