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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 644 · 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 42 =
  2. 2.Half of 134 =
  3. 3.Double 72 =
  4. 4.Double 66 =
  5. 5.Half of 84 =
  6. 6.Half of 68 =
  7. 7.Double 95 =
  8. 8.Double 31 =
  9. 9.Half of 184 =
  10. 10.Double 57 =
  11. 11.Half of 64 =
  12. 12.Double 61 =
  13. 13.Half of 158 =
  14. 14.Half of 52 =
  15. 15.Double 84 =
  16. 16.Double 25 =
  17. 17.Double 77 =
  18. 18.Double 48 =
  19. 19.Double 76 =
  20. 20.Double 79 =
  21. 21.Double 51 =
  22. 22.Half of 198 =
  23. 23.Double 52 =
  24. 24.Double 82 =
  25. 25.Half of 106 =
  26. 26.Half of 96 =
  27. 27.Double 54 =
  28. 28.Double 35 =
  29. 29.Double 21 =
  30. 30.Double 88 =
  31. 31.Double 83 =
  32. 32.Half of 144 =
  33. 33.Half of 108 =
  34. 34.Double 37 =
  35. 35.Double 91 =
  36. 36.Double 81 =
  37. 37.Half of 36 =
  38. 38.Double 49 =
  39. 39.Half of 132 =
  40. 40.Double 92 =

Answer key

  1. 84
  2. 67
  3. 144
  4. 132
  5. 42
  6. 34
  7. 190
  8. 62
  9. 92
  10. 114
  11. 32
  12. 122
  13. 79
  14. 26
  15. 168
  16. 50
  17. 154
  18. 96
  19. 152
  20. 158
  21. 102
  22. 99
  23. 104
  24. 164
  25. 53
  26. 48
  27. 108
  28. 70
  29. 42
  30. 176
  31. 166
  32. 72
  33. 54
  34. 74
  35. 182
  36. 162
  37. 18
  38. 98
  39. 66
  40. 184

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