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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 732 · 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 72 =
  2. 2.Double 29 =
  3. 3.Half of 154 =
  4. 4.Double 67 =
  5. 5.Half of 160 =
  6. 6.Half of 166 =
  7. 7.Half of 48 =
  8. 8.Double 63 =
  9. 9.Double 91 =
  10. 10.Double 56 =
  11. 11.Half of 164 =
  12. 12.Half of 26 =
  13. 13.Double 21 =
  14. 14.Double 81 =
  15. 15.Half of 104 =
  16. 16.Half of 38 =
  17. 17.Double 61 =
  18. 18.Double 66 =
  19. 19.Half of 128 =
  20. 20.Double 38 =
  21. 21.Half of 190 =
  22. 22.Half of 70 =
  23. 23.Half of 36 =
  24. 24.Half of 76 =
  25. 25.Double 39 =
  26. 26.Double 82 =
  27. 27.Double 53 =
  28. 28.Half of 172 =
  29. 29.Half of 44 =
  30. 30.Half of 56 =
  31. 31.Half of 156 =
  32. 32.Half of 84 =
  33. 33.Half of 192 =
  34. 34.Double 83 =
  35. 35.Half of 62 =
  36. 36.Double 71 =
  37. 37.Half of 110 =
  38. 38.Double 26 =
  39. 39.Half of 124 =
  40. 40.Half of 130 =

Answer key

  1. 36
  2. 58
  3. 77
  4. 134
  5. 80
  6. 83
  7. 24
  8. 126
  9. 182
  10. 112
  11. 82
  12. 13
  13. 42
  14. 162
  15. 52
  16. 19
  17. 122
  18. 132
  19. 64
  20. 76
  21. 95
  22. 35
  23. 18
  24. 38
  25. 78
  26. 164
  27. 106
  28. 86
  29. 22
  30. 28
  31. 78
  32. 42
  33. 96
  34. 166
  35. 31
  36. 142
  37. 55
  38. 52
  39. 62
  40. 65

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