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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 384 · 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 95 =
  2. 2.Double 45 =
  3. 3.Half of 36 =
  4. 4.Double 43 =
  5. 5.Double 27 =
  6. 6.Double 38 =
  7. 7.Half of 42 =
  8. 8.Double 49 =
  9. 9.Double 57 =
  10. 10.Half of 118 =
  11. 11.Half of 110 =
  12. 12.Half of 52 =
  13. 13.Half of 158 =
  14. 14.Double 61 =
  15. 15.Double 59 =
  16. 16.Double 31 =
  17. 17.Double 52 =
  18. 18.Double 98 =
  19. 19.Half of 150 =
  20. 20.Half of 184 =
  21. 21.Double 83 =
  22. 22.Half of 122 =
  23. 23.Half of 62 =
  24. 24.Double 84 =
  25. 25.Double 97 =
  26. 26.Double 71 =
  27. 27.Half of 32 =
  28. 28.Double 99 =
  29. 29.Double 86 =
  30. 30.Double 94 =
  31. 31.Half of 194 =
  32. 32.Half of 176 =
  33. 33.Double 81 =
  34. 34.Double 82 =
  35. 35.Double 25 =
  36. 36.Double 19 =
  37. 37.Half of 102 =
  38. 38.Double 46 =
  39. 39.Half of 56 =
  40. 40.Double 54 =

Answer key

  1. 190
  2. 90
  3. 18
  4. 86
  5. 54
  6. 76
  7. 21
  8. 98
  9. 114
  10. 59
  11. 55
  12. 26
  13. 79
  14. 122
  15. 118
  16. 62
  17. 104
  18. 196
  19. 75
  20. 92
  21. 166
  22. 61
  23. 31
  24. 168
  25. 194
  26. 142
  27. 16
  28. 198
  29. 172
  30. 188
  31. 97
  32. 88
  33. 162
  34. 164
  35. 50
  36. 38
  37. 51
  38. 92
  39. 28
  40. 108

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