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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 855 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 88 =
  2. 2.Double 92 =
  3. 3.Double 21 =
  4. 4.Double 99 =
  5. 5.Double 66 =
  6. 6.Half of 26 =
  7. 7.Half of 56 =
  8. 8.Half of 78 =
  9. 9.Double 23 =
  10. 10.Half of 58 =
  11. 11.Double 25 =
  12. 12.Double 17 =
  13. 13.Half of 82 =
  14. 14.Double 93 =
  15. 15.Half of 50 =
  16. 16.Double 49 =
  17. 17.Half of 64 =
  18. 18.Half of 42 =
  19. 19.Double 73 =
  20. 20.Double 33 =
  21. 21.Double 39 =
  22. 22.Double 51 =
  23. 23.Double 85 =
  24. 24.Double 75 =
  25. 25.Half of 156 =
  26. 26.Half of 54 =
  27. 27.Double 89 =
  28. 28.Double 61 =
  29. 29.Half of 146 =
  30. 30.Half of 84 =
  31. 31.Half of 60 =
  32. 32.Half of 144 =
  33. 33.Half of 136 =
  34. 34.Double 98 =
  35. 35.Half of 100 =
  36. 36.Double 18 =
  37. 37.Double 37 =
  38. 38.Half of 38 =
  39. 39.Half of 46 =
  40. 40.Half of 36 =

Answer key

  1. 176
  2. 184
  3. 42
  4. 198
  5. 132
  6. 13
  7. 28
  8. 39
  9. 46
  10. 29
  11. 50
  12. 34
  13. 41
  14. 186
  15. 25
  16. 98
  17. 32
  18. 21
  19. 146
  20. 66
  21. 78
  22. 102
  23. 170
  24. 150
  25. 78
  26. 27
  27. 178
  28. 122
  29. 73
  30. 42
  31. 30
  32. 72
  33. 68
  34. 196
  35. 50
  36. 36
  37. 74
  38. 19
  39. 23
  40. 18

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