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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 642 · 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 47 =
  2. 2.Half of 66 =
  3. 3.Double 71 =
  4. 4.Half of 64 =
  5. 5.Half of 74 =
  6. 6.Half of 134 =
  7. 7.Half of 106 =
  8. 8.Double 31 =
  9. 9.Double 72 =
  10. 10.Double 23 =
  11. 11.Half of 168 =
  12. 12.Half of 120 =
  13. 13.Half of 90 =
  14. 14.Half of 54 =
  15. 15.Half of 42 =
  16. 16.Double 82 =
  17. 17.Double 29 =
  18. 18.Double 78 =
  19. 19.Double 94 =
  20. 20.Half of 60 =
  21. 21.Half of 144 =
  22. 22.Double 67 =
  23. 23.Half of 130 =
  24. 24.Double 59 =
  25. 25.Half of 100 =
  26. 26.Half of 58 =
  27. 27.Half of 62 =
  28. 28.Half of 68 =
  29. 29.Double 91 =
  30. 30.Half of 98 =
  31. 31.Half of 126 =
  32. 32.Double 99 =
  33. 33.Double 84 =
  34. 34.Half of 50 =
  35. 35.Double 93 =
  36. 36.Half of 176 =
  37. 37.Double 55 =
  38. 38.Half of 52 =
  39. 39.Half of 140 =
  40. 40.Half of 28 =

Answer key

  1. 94
  2. 33
  3. 142
  4. 32
  5. 37
  6. 67
  7. 53
  8. 62
  9. 144
  10. 46
  11. 84
  12. 60
  13. 45
  14. 27
  15. 21
  16. 164
  17. 58
  18. 156
  19. 188
  20. 30
  21. 72
  22. 134
  23. 65
  24. 118
  25. 50
  26. 29
  27. 31
  28. 34
  29. 182
  30. 49
  31. 63
  32. 198
  33. 168
  34. 25
  35. 186
  36. 88
  37. 110
  38. 26
  39. 70
  40. 14

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