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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 272 · 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.Half of 26 =
  2. 2.Double 72 =
  3. 3.Double 21 =
  4. 4.Half of 52 =
  5. 5.Half of 146 =
  6. 6.Double 51 =
  7. 7.Half of 162 =
  8. 8.Half of 114 =
  9. 9.Half of 36 =
  10. 10.Half of 30 =
  11. 11.Half of 176 =
  12. 12.Double 86 =
  13. 13.Double 84 =
  14. 14.Half of 164 =
  15. 15.Half of 142 =
  16. 16.Half of 178 =
  17. 17.Double 31 =
  18. 18.Double 81 =
  19. 19.Double 56 =
  20. 20.Double 55 =
  21. 21.Double 57 =
  22. 22.Double 99 =
  23. 23.Double 18 =
  24. 24.Double 61 =
  25. 25.Double 54 =
  26. 26.Half of 34 =
  27. 27.Half of 42 =
  28. 28.Half of 166 =
  29. 29.Half of 168 =
  30. 30.Double 83 =
  31. 31.Half of 50 =
  32. 32.Half of 56 =
  33. 33.Double 63 =
  34. 34.Half of 136 =
  35. 35.Double 89 =
  36. 36.Half of 46 =
  37. 37.Half of 38 =
  38. 38.Double 59 =
  39. 39.Half of 186 =
  40. 40.Double 36 =

Answer key

  1. 13
  2. 144
  3. 42
  4. 26
  5. 73
  6. 102
  7. 81
  8. 57
  9. 18
  10. 15
  11. 88
  12. 172
  13. 168
  14. 82
  15. 71
  16. 89
  17. 62
  18. 162
  19. 112
  20. 110
  21. 114
  22. 198
  23. 36
  24. 122
  25. 108
  26. 17
  27. 21
  28. 83
  29. 84
  30. 166
  31. 25
  32. 28
  33. 126
  34. 68
  35. 178
  36. 23
  37. 19
  38. 118
  39. 93
  40. 72

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