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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 235 · 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 66 =
  2. 2.Half of 94 =
  3. 3.Double 52 =
  4. 4.Double 91 =
  5. 5.Half of 42 =
  6. 6.Double 16 =
  7. 7.Double 81 =
  8. 8.Half of 124 =
  9. 9.Half of 164 =
  10. 10.Half of 78 =
  11. 11.Half of 144 =
  12. 12.Half of 170 =
  13. 13.Half of 122 =
  14. 14.Double 33 =
  15. 15.Double 31 =
  16. 16.Double 61 =
  17. 17.Half of 134 =
  18. 18.Double 46 =
  19. 19.Half of 174 =
  20. 20.Half of 40 =
  21. 21.Double 77 =
  22. 22.Double 87 =
  23. 23.Double 45 =
  24. 24.Double 49 =
  25. 25.Double 18 =
  26. 26.Half of 68 =
  27. 27.Double 83 =
  28. 28.Double 38 =
  29. 29.Double 19 =
  30. 30.Half of 36 =
  31. 31.Double 28 =
  32. 32.Half of 84 =
  33. 33.Double 39 =
  34. 34.Double 34 =
  35. 35.Double 54 =
  36. 36.Half of 46 =
  37. 37.Half of 44 =
  38. 38.Double 95 =
  39. 39.Half of 34 =
  40. 40.Double 41 =

Answer key

  1. 132
  2. 47
  3. 104
  4. 182
  5. 21
  6. 32
  7. 162
  8. 62
  9. 82
  10. 39
  11. 72
  12. 85
  13. 61
  14. 66
  15. 62
  16. 122
  17. 67
  18. 92
  19. 87
  20. 20
  21. 154
  22. 174
  23. 90
  24. 98
  25. 36
  26. 34
  27. 166
  28. 76
  29. 38
  30. 18
  31. 56
  32. 42
  33. 78
  34. 68
  35. 108
  36. 23
  37. 22
  38. 190
  39. 17
  40. 82

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