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# 4 Rules of Fractions

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The four rules - adding, subtracting, division and multiplication - with fractions

The four rules - adding, subtracting, division and multiplication - with fractions

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### Transcript

• 1. FRACTIONS
• subtract
• multiply and
• divide fractions
• To add fractions together the denominator (the bottom bit) must be the same.
• Example
• To add fractions together the denominator (the bottom bit) must be the same.
• Example
• To add fractions together the denominator (the bottom bit) must be the same.
• Example
• 5. Now try these
• Click to see the next slide to reveal the answers.
• 1 . 2 .
• 3 . 4 .
• 6. Now try these
• 1 . 2 .
• 3 . 4 .
• 7. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
• 8. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
• 9. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
• 10. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
• 11. Now try these . 1 . 2 . 3 . 4 .
• 12. Multiplying fractions To multiply fractions we multiply the tops and multiply the bottoms Top x Top Bottom x Bottom
• 13. Multiplying fractions Example
• 14. Multiplying fractions Example
• 15. Multiplying fractions Example
• 16. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
• 17. Now try these . 1 . 2 . 3 . 4 .
• 18. 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!
• 19. Dividing fractions
• Turn the second fraction upside down
Example
• 20. Dividing fractions
• Turn the second fraction upside down
Example
• Change the divide into a multiply
• 21. Dividing fractions
• Turn the second fraction upside down
Example
• Change the divide into a multiply
• Then multiply
• 22. Dividing fractions
• Turn the second fraction upside down
Example
• Change the divide into a multiply
• Then multiply
• 23. Now try these Click on the next screen to reveal the answers. 1 . 2 . 3 . 4 .
• 24. Now try these 1 . 2 . 3 . 4 .
• 25. 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
• 26. 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
• 27. Common denominators
• For example
• 28. Common denominators
• For example
• Multiply the bottoms together
• 29. Common denominators
• For example
2. Write the two fractions as sixths
• 30. 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
• 31. 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
• 32. 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
• 33. 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
• 34. Common denominators
• For example
We can now rewrite
• 35. Common denominators
• For example
We can now rewrite
• 36. Common denominators
• For example
We can now rewrite
• 37. Common denominators
• For example
We can now rewrite
• 38. Common denominators This is what we have done: 1. Multiply the bottoms
• 39. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
• 40. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
• 41. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
• 42. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
• 43. Now try these . 1 . 2 . 3 . 4 .
• 44. For further info
• Go to:
• BBC Bitesize Maths Revision site
• by clicking here: