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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 65 · 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 60 =
  2. 2.Half of 168 =
  3. 3.Half of 128 =
  4. 4.Half of 74 =
  5. 5.Double 95 =
  6. 6.Half of 84 =
  7. 7.Half of 174 =
  8. 8.Half of 162 =
  9. 9.Half of 108 =
  10. 10.Double 91 =
  11. 11.Double 57 =
  12. 12.Half of 140 =
  13. 13.Half of 58 =
  14. 14.Double 53 =
  15. 15.Double 49 =
  16. 16.Half of 100 =
  17. 17.Double 32 =
  18. 18.Half of 34 =
  19. 19.Half of 50 =
  20. 20.Half of 124 =
  21. 21.Double 96 =
  22. 22.Double 17 =
  23. 23.Double 58 =
  24. 24.Double 21 =
  25. 25.Double 19 =
  26. 26.Half of 126 =
  27. 27.Half of 146 =
  28. 28.Double 82 =
  29. 29.Half of 104 =
  30. 30.Half of 68 =
  31. 31.Double 83 =
  32. 32.Double 76 =
  33. 33.Double 43 =
  34. 34.Double 29 =
  35. 35.Half of 66 =
  36. 36.Double 94 =
  37. 37.Double 81 =
  38. 38.Double 85 =
  39. 39.Double 77 =
  40. 40.Half of 184 =

Answer key

  1. 30
  2. 84
  3. 64
  4. 37
  5. 190
  6. 42
  7. 87
  8. 81
  9. 54
  10. 182
  11. 114
  12. 70
  13. 29
  14. 106
  15. 98
  16. 50
  17. 64
  18. 17
  19. 25
  20. 62
  21. 192
  22. 34
  23. 116
  24. 42
  25. 38
  26. 63
  27. 73
  28. 164
  29. 52
  30. 34
  31. 166
  32. 152
  33. 86
  34. 58
  35. 33
  36. 188
  37. 162
  38. 170
  39. 154
  40. 92

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