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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 631 · 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 128 =
  2. 2.Double 35 =
  3. 3.Half of 192 =
  4. 4.Half of 58 =
  5. 5.Double 39 =
  6. 6.Half of 64 =
  7. 7.Double 64 =
  8. 8.Double 59 =
  9. 9.Half of 144 =
  10. 10.Double 88 =
  11. 11.Half of 180 =
  12. 12.Double 58 =
  13. 13.Half of 96 =
  14. 14.Half of 44 =
  15. 15.Half of 88 =
  16. 16.Double 68 =
  17. 17.Double 85 =
  18. 18.Double 72 =
  19. 19.Double 23 =
  20. 20.Double 63 =
  21. 21.Double 71 =
  22. 22.Double 95 =
  23. 23.Double 96 =
  24. 24.Double 52 =
  25. 25.Double 37 =
  26. 26.Half of 116 =
  27. 27.Half of 52 =
  28. 28.Half of 84 =
  29. 29.Double 17 =
  30. 30.Double 41 =
  31. 31.Double 61 =
  32. 32.Half of 194 =
  33. 33.Half of 196 =
  34. 34.Half of 106 =
  35. 35.Half of 82 =
  36. 36.Double 83 =
  37. 37.Double 86 =
  38. 38.Half of 62 =
  39. 39.Double 66 =
  40. 40.Half of 184 =

Answer key

  1. 64
  2. 70
  3. 96
  4. 29
  5. 78
  6. 32
  7. 128
  8. 118
  9. 72
  10. 176
  11. 90
  12. 116
  13. 48
  14. 22
  15. 44
  16. 136
  17. 170
  18. 144
  19. 46
  20. 126
  21. 142
  22. 190
  23. 192
  24. 104
  25. 74
  26. 58
  27. 26
  28. 42
  29. 34
  30. 82
  31. 122
  32. 97
  33. 98
  34. 53
  35. 41
  36. 166
  37. 172
  38. 31
  39. 132
  40. 92

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