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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 520 · 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 58 =
  2. 2.Double 17 =
  3. 3.Half of 182 =
  4. 4.Double 44 =
  5. 5.Double 41 =
  6. 6.Double 77 =
  7. 7.Double 61 =
  8. 8.Half of 84 =
  9. 9.Half of 126 =
  10. 10.Double 59 =
  11. 11.Double 66 =
  12. 12.Half of 96 =
  13. 13.Double 36 =
  14. 14.Double 95 =
  15. 15.Double 74 =
  16. 16.Double 78 =
  17. 17.Double 89 =
  18. 18.Double 81 =
  19. 19.Half of 170 =
  20. 20.Double 99 =
  21. 21.Half of 92 =
  22. 22.Double 55 =
  23. 23.Double 71 =
  24. 24.Double 79 =
  25. 25.Double 49 =
  26. 26.Half of 128 =
  27. 27.Double 47 =
  28. 28.Half of 60 =
  29. 29.Half of 76 =
  30. 30.Half of 82 =
  31. 31.Half of 172 =
  32. 32.Double 51 =
  33. 33.Double 76 =
  34. 34.Double 91 =
  35. 35.Half of 114 =
  36. 36.Half of 62 =
  37. 37.Half of 106 =
  38. 38.Half of 192 =
  39. 39.Double 21 =
  40. 40.Double 68 =

Answer key

  1. 116
  2. 34
  3. 91
  4. 88
  5. 82
  6. 154
  7. 122
  8. 42
  9. 63
  10. 118
  11. 132
  12. 48
  13. 72
  14. 190
  15. 148
  16. 156
  17. 178
  18. 162
  19. 85
  20. 198
  21. 46
  22. 110
  23. 142
  24. 158
  25. 98
  26. 64
  27. 94
  28. 30
  29. 38
  30. 41
  31. 86
  32. 102
  33. 152
  34. 182
  35. 57
  36. 31
  37. 53
  38. 96
  39. 42
  40. 136

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