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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 23 · 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 178 =
  2. 2.Double 91 =
  3. 3.Double 82 =
  4. 4.Half of 84 =
  5. 5.Half of 68 =
  6. 6.Half of 186 =
  7. 7.Double 41 =
  8. 8.Double 21 =
  9. 9.Half of 110 =
  10. 10.Half of 182 =
  11. 11.Half of 142 =
  12. 12.Half of 100 =
  13. 13.Double 92 =
  14. 14.Half of 60 =
  15. 15.Double 81 =
  16. 16.Half of 188 =
  17. 17.Half of 134 =
  18. 18.Double 71 =
  19. 19.Double 57 =
  20. 20.Double 84 =
  21. 21.Double 29 =
  22. 22.Double 63 =
  23. 23.Double 37 =
  24. 24.Half of 66 =
  25. 25.Half of 180 =
  26. 26.Half of 92 =
  27. 27.Double 95 =
  28. 28.Double 78 =
  29. 29.Double 69 =
  30. 30.Half of 56 =
  31. 31.Double 83 =
  32. 32.Half of 30 =
  33. 33.Double 54 =
  34. 34.Double 72 =
  35. 35.Half of 158 =
  36. 36.Double 44 =
  37. 37.Double 56 =
  38. 38.Half of 44 =
  39. 39.Half of 136 =
  40. 40.Half of 32 =

Answer key

  1. 89
  2. 182
  3. 164
  4. 42
  5. 34
  6. 93
  7. 82
  8. 42
  9. 55
  10. 91
  11. 71
  12. 50
  13. 184
  14. 30
  15. 162
  16. 94
  17. 67
  18. 142
  19. 114
  20. 168
  21. 58
  22. 126
  23. 74
  24. 33
  25. 90
  26. 46
  27. 190
  28. 156
  29. 138
  30. 28
  31. 166
  32. 15
  33. 108
  34. 144
  35. 79
  36. 88
  37. 112
  38. 22
  39. 68
  40. 16

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