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4 Rules of Fractions

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

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4 Rules of Fractions

  1. 1. FRACTIONS <ul><li>This presentation will help you to: </li></ul><ul><li>add </li></ul><ul><li>subtract </li></ul><ul><li>multiply and </li></ul><ul><li>divide fractions </li></ul>
  2. 2. Adding fractions <ul><li>To add fractions together the denominator (the bottom bit) must be the same. </li></ul><ul><li>Example </li></ul>
  3. 3. Adding fractions <ul><li>To add fractions together the denominator (the bottom bit) must be the same. </li></ul><ul><li>Example </li></ul>
  4. 4. Adding fractions <ul><li>To add fractions together the denominator (the bottom bit) must be the same. </li></ul><ul><li>Example </li></ul>
  5. 5. Now try these <ul><li>Click to see the next slide to reveal the answers. </li></ul><ul><li>1 . 2 . </li></ul><ul><li>3 . 4 . </li></ul>
  6. 6. Now try these <ul><li>1 . 2 . </li></ul><ul><li>3 . 4 . </li></ul>
  7. 7. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
  8. 8. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
  9. 9. Subtracting fractions To subtract fractions the denominator (the bottom bit) must be the same. Example
  10. 10. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
  11. 11. Now try these . 1 . 2 . 3 . 4 .
  12. 12. Multiplying fractions To multiply fractions we multiply the tops and multiply the bottoms Top x Top Bottom x Bottom
  13. 13. Multiplying fractions Example
  14. 14. Multiplying fractions Example
  15. 15. Multiplying fractions Example
  16. 16. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
  17. 17. Now try these . 1 . 2 . 3 . 4 .
  18. 18. Dividing fractions Once you know a simple trick, dividing is as easy as multiplying! <ul><li>Turn the second fraction upside down </li></ul><ul><li>Change the divide to multiply </li></ul><ul><li>Then multiply! </li></ul>
  19. 19. Dividing fractions <ul><li>Turn the second fraction upside down </li></ul>Example
  20. 20. Dividing fractions <ul><li>Turn the second fraction upside down </li></ul>Example <ul><li>Change the divide into a multiply </li></ul>
  21. 21. Dividing fractions <ul><li>Turn the second fraction upside down </li></ul>Example <ul><li>Change the divide into a multiply </li></ul><ul><li>Then multiply </li></ul>
  22. 22. Dividing fractions <ul><li>Turn the second fraction upside down </li></ul>Example <ul><li>Change the divide into a multiply </li></ul><ul><li>Then multiply </li></ul>
  23. 23. Now try these Click on the next screen to reveal the answers. 1 . 2 . 3 . 4 .
  24. 24. Now try these 1 . 2 . 3 . 4 .
  25. 25. Common denominators <ul><li>To add or subtract fractions together the denominator (the bottom bit) must be the same. </li></ul>So, sometimes we have to change the bottoms to make them the same. In “maths-speak” we say we must get common denominators
  26. 26. Common denominators <ul><li>To get a common denominator we have to: </li></ul>1. Multiply the bottoms together. 2. Then multiply the top bit by the correct number to get an equivalent fraction
  27. 27. Common denominators <ul><li>For example </li></ul>
  28. 28. Common denominators <ul><li>For example </li></ul><ul><li>Multiply the bottoms together </li></ul>
  29. 29. Common denominators <ul><li>For example </li></ul>2. Write the two fractions as sixths
  30. 30. Common denominators <ul><li>For example </li></ul>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. 31. Common denominators <ul><li>For example </li></ul>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. 32. Common denominators <ul><li>For example </li></ul>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. 33. Common denominators <ul><li>For example </li></ul>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. 34. Common denominators <ul><li>For example </li></ul>We can now rewrite
  35. 35. Common denominators <ul><li>For example </li></ul>We can now rewrite
  36. 36. Common denominators <ul><li>For example </li></ul>We can now rewrite
  37. 37. Common denominators <ul><li>For example </li></ul>We can now rewrite
  38. 38. Common denominators This is what we have done: 1. Multiply the bottoms
  39. 39. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
  40. 40. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
  41. 41. Common denominators This is what we have done: 1. Multiply the bottoms 2.Cross multiply
  42. 42. Now try these Click on the next slide to reveal the answers. 1 . 2 . 3 . 4 .
  43. 43. Now try these . 1 . 2 . 3 . 4 .
  44. 44. For further info <ul><li>Go to: </li></ul><ul><li>BBC Bitesize Maths Revision site </li></ul><ul><li>by clicking here: </li></ul>

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