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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 408 · 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 78 =
  2. 2.Double 63 =
  3. 3.Double 64 =
  4. 4.Half of 180 =
  5. 5.Half of 160 =
  6. 6.Half of 74 =
  7. 7.Half of 46 =
  8. 8.Double 33 =
  9. 9.Half of 122 =
  10. 10.Half of 120 =
  11. 11.Half of 104 =
  12. 12.Double 99 =
  13. 13.Double 39 =
  14. 14.Double 81 =
  15. 15.Half of 106 =
  16. 16.Half of 108 =
  17. 17.Half of 76 =
  18. 18.Double 41 =
  19. 19.Double 79 =
  20. 20.Double 23 =
  21. 21.Half of 114 =
  22. 22.Half of 38 =
  23. 23.Double 93 =
  24. 24.Double 45 =
  25. 25.Double 57 =
  26. 26.Half of 30 =
  27. 27.Double 55 =
  28. 28.Double 61 =
  29. 29.Double 89 =
  30. 30.Half of 134 =
  31. 31.Double 74 =
  32. 32.Double 72 =
  33. 33.Double 83 =
  34. 34.Half of 66 =
  35. 35.Double 21 =
  36. 36.Double 19 =
  37. 37.Half of 70 =
  38. 38.Double 91 =
  39. 39.Half of 40 =
  40. 40.Half of 128 =

Answer key

  1. 156
  2. 126
  3. 128
  4. 90
  5. 80
  6. 37
  7. 23
  8. 66
  9. 61
  10. 60
  11. 52
  12. 198
  13. 78
  14. 162
  15. 53
  16. 54
  17. 38
  18. 82
  19. 158
  20. 46
  21. 57
  22. 19
  23. 186
  24. 90
  25. 114
  26. 15
  27. 110
  28. 122
  29. 178
  30. 67
  31. 148
  32. 144
  33. 166
  34. 33
  35. 42
  36. 38
  37. 35
  38. 182
  39. 20
  40. 64

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