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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 815 · 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 81 =
  2. 2.Half of 56 =
  3. 3.Half of 52 =
  4. 4.Double 52 =
  5. 5.Double 47 =
  6. 6.Half of 166 =
  7. 7.Half of 164 =
  8. 8.Double 46 =
  9. 9.Half of 74 =
  10. 10.Double 68 =
  11. 11.Half of 62 =
  12. 12.Double 48 =
  13. 13.Double 57 =
  14. 14.Double 84 =
  15. 15.Double 37 =
  16. 16.Half of 106 =
  17. 17.Half of 54 =
  18. 18.Double 83 =
  19. 19.Double 71 =
  20. 20.Half of 124 =
  21. 21.Half of 42 =
  22. 22.Double 29 =
  23. 23.Double 58 =
  24. 24.Half of 192 =
  25. 25.Half of 46 =
  26. 26.Half of 144 =
  27. 27.Double 49 =
  28. 28.Half of 154 =
  29. 29.Double 65 =
  30. 30.Double 86 =
  31. 31.Half of 114 =
  32. 32.Half of 132 =
  33. 33.Half of 178 =
  34. 34.Double 89 =
  35. 35.Half of 184 =
  36. 36.Half of 116 =
  37. 37.Half of 72 =
  38. 38.Half of 102 =
  39. 39.Double 85 =
  40. 40.Double 72 =

Answer key

  1. 162
  2. 28
  3. 26
  4. 104
  5. 94
  6. 83
  7. 82
  8. 92
  9. 37
  10. 136
  11. 31
  12. 96
  13. 114
  14. 168
  15. 74
  16. 53
  17. 27
  18. 166
  19. 142
  20. 62
  21. 21
  22. 58
  23. 116
  24. 96
  25. 23
  26. 72
  27. 98
  28. 77
  29. 130
  30. 172
  31. 57
  32. 66
  33. 89
  34. 178
  35. 92
  36. 58
  37. 36
  38. 51
  39. 170
  40. 144

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