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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 105 · 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 52 =
  2. 2.Half of 36 =
  3. 3.Double 72 =
  4. 4.Double 99 =
  5. 5.Half of 68 =
  6. 6.Double 66 =
  7. 7.Double 52 =
  8. 8.Double 54 =
  9. 9.Half of 116 =
  10. 10.Half of 32 =
  11. 11.Half of 76 =
  12. 12.Half of 140 =
  13. 13.Half of 82 =
  14. 14.Half of 66 =
  15. 15.Double 19 =
  16. 16.Half of 120 =
  17. 17.Half of 62 =
  18. 18.Half of 108 =
  19. 19.Half of 194 =
  20. 20.Half of 34 =
  21. 21.Double 89 =
  22. 22.Half of 172 =
  23. 23.Half of 58 =
  24. 24.Half of 188 =
  25. 25.Double 36 =
  26. 26.Double 34 =
  27. 27.Half of 180 =
  28. 28.Double 63 =
  29. 29.Half of 134 =
  30. 30.Double 43 =
  31. 31.Double 82 =
  32. 32.Half of 26 =
  33. 33.Double 31 =
  34. 34.Double 25 =
  35. 35.Double 39 =
  36. 36.Double 56 =
  37. 37.Double 81 =
  38. 38.Half of 90 =
  39. 39.Half of 158 =
  40. 40.Double 71 =

Answer key

  1. 26
  2. 18
  3. 144
  4. 198
  5. 34
  6. 132
  7. 104
  8. 108
  9. 58
  10. 16
  11. 38
  12. 70
  13. 41
  14. 33
  15. 38
  16. 60
  17. 31
  18. 54
  19. 97
  20. 17
  21. 178
  22. 86
  23. 29
  24. 94
  25. 72
  26. 68
  27. 90
  28. 126
  29. 67
  30. 86
  31. 164
  32. 13
  33. 62
  34. 50
  35. 78
  36. 112
  37. 162
  38. 45
  39. 79
  40. 142

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