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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 45 · 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 57 =
  2. 2.Double 19 =
  3. 3.Half of 166 =
  4. 4.Half of 82 =
  5. 5.Half of 122 =
  6. 6.Double 32 =
  7. 7.Half of 80 =
  8. 8.Double 93 =
  9. 9.Half of 112 =
  10. 10.Double 91 =
  11. 11.Double 89 =
  12. 12.Half of 106 =
  13. 13.Half of 156 =
  14. 14.Double 26 =
  15. 15.Double 95 =
  16. 16.Double 43 =
  17. 17.Double 27 =
  18. 18.Double 71 =
  19. 19.Double 36 =
  20. 20.Double 33 =
  21. 21.Double 51 =
  22. 22.Half of 46 =
  23. 23.Double 17 =
  24. 24.Half of 158 =
  25. 25.Half of 96 =
  26. 26.Half of 128 =
  27. 27.Double 41 =
  28. 28.Double 49 =
  29. 29.Double 47 =
  30. 30.Half of 60 =
  31. 31.Double 99 =
  32. 32.Double 63 =
  33. 33.Double 31 =
  34. 34.Half of 66 =
  35. 35.Double 65 =
  36. 36.Double 86 =
  37. 37.Double 35 =
  38. 38.Double 81 =
  39. 39.Half of 160 =
  40. 40.Double 73 =

Answer key

  1. 114
  2. 38
  3. 83
  4. 41
  5. 61
  6. 64
  7. 40
  8. 186
  9. 56
  10. 182
  11. 178
  12. 53
  13. 78
  14. 52
  15. 190
  16. 86
  17. 54
  18. 142
  19. 72
  20. 66
  21. 102
  22. 23
  23. 34
  24. 79
  25. 48
  26. 64
  27. 82
  28. 98
  29. 94
  30. 30
  31. 198
  32. 126
  33. 62
  34. 33
  35. 130
  36. 172
  37. 70
  38. 162
  39. 80
  40. 146

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