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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 453 · 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 62 =
  2. 2.Double 23 =
  3. 3.Double 71 =
  4. 4.Double 89 =
  5. 5.Double 18 =
  6. 6.Double 31 =
  7. 7.Half of 104 =
  8. 8.Half of 80 =
  9. 9.Double 19 =
  10. 10.Half of 72 =
  11. 11.Half of 142 =
  12. 12.Half of 54 =
  13. 13.Half of 182 =
  14. 14.Double 68 =
  15. 15.Double 81 =
  16. 16.Half of 148 =
  17. 17.Half of 178 =
  18. 18.Double 33 =
  19. 19.Double 35 =
  20. 20.Half of 62 =
  21. 21.Half of 146 =
  22. 22.Half of 30 =
  23. 23.Double 84 =
  24. 24.Double 92 =
  25. 25.Double 27 =
  26. 26.Double 57 =
  27. 27.Double 82 =
  28. 28.Half of 58 =
  29. 29.Half of 134 =
  30. 30.Double 75 =
  31. 31.Half of 128 =
  32. 32.Half of 140 =
  33. 33.Double 91 =
  34. 34.Half of 124 =
  35. 35.Half of 136 =
  36. 36.Half of 186 =
  37. 37.Half of 74 =
  38. 38.Double 83 =
  39. 39.Half of 26 =
  40. 40.Half of 130 =

Answer key

  1. 124
  2. 46
  3. 142
  4. 178
  5. 36
  6. 62
  7. 52
  8. 40
  9. 38
  10. 36
  11. 71
  12. 27
  13. 91
  14. 136
  15. 162
  16. 74
  17. 89
  18. 66
  19. 70
  20. 31
  21. 73
  22. 15
  23. 168
  24. 184
  25. 54
  26. 114
  27. 164
  28. 29
  29. 67
  30. 150
  31. 64
  32. 70
  33. 182
  34. 62
  35. 68
  36. 93
  37. 37
  38. 166
  39. 13
  40. 65

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