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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 320 · 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 24 =
  2. 2.Half of 28 =
  3. 3.Half of 186 =
  4. 4.Half of 138 =
  5. 5.Half of 74 =
  6. 6.Double 59 =
  7. 7.Double 29 =
  8. 8.Double 98 =
  9. 9.Half of 90 =
  10. 10.Half of 32 =
  11. 11.Half of 40 =
  12. 12.Double 97 =
  13. 13.Double 71 =
  14. 14.Half of 116 =
  15. 15.Half of 142 =
  16. 16.Half of 174 =
  17. 17.Half of 110 =
  18. 18.Double 57 =
  19. 19.Double 91 =
  20. 20.Half of 164 =
  21. 21.Double 81 =
  22. 22.Double 61 =
  23. 23.Half of 144 =
  24. 24.Half of 170 =
  25. 25.Half of 122 =
  26. 26.Double 78 =
  27. 27.Double 45 =
  28. 28.Double 86 =
  29. 29.Double 35 =
  30. 30.Half of 68 =
  31. 31.Half of 84 =
  32. 32.Half of 152 =
  33. 33.Half of 36 =
  34. 34.Double 93 =
  35. 35.Double 49 =
  36. 36.Double 82 =
  37. 37.Double 68 =
  38. 38.Half of 76 =
  39. 39.Half of 146 =
  40. 40.Half of 34 =

Answer key

  1. 48
  2. 14
  3. 93
  4. 69
  5. 37
  6. 118
  7. 58
  8. 196
  9. 45
  10. 16
  11. 20
  12. 194
  13. 142
  14. 58
  15. 71
  16. 87
  17. 55
  18. 114
  19. 182
  20. 82
  21. 162
  22. 122
  23. 72
  24. 85
  25. 61
  26. 156
  27. 90
  28. 172
  29. 70
  30. 34
  31. 42
  32. 76
  33. 18
  34. 186
  35. 98
  36. 164
  37. 136
  38. 38
  39. 73
  40. 17

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