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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 237 · 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 108 =
  2. 2.Half of 156 =
  3. 3.Half of 48 =
  4. 4.Half of 124 =
  5. 5.Half of 78 =
  6. 6.Double 71 =
  7. 7.Half of 122 =
  8. 8.Half of 96 =
  9. 9.Double 31 =
  10. 10.Double 83 =
  11. 11.Half of 28 =
  12. 12.Half of 178 =
  13. 13.Half of 30 =
  14. 14.Double 79 =
  15. 15.Half of 196 =
  16. 16.Half of 184 =
  17. 17.Double 22 =
  18. 18.Double 91 =
  19. 19.Double 97 =
  20. 20.Half of 54 =
  21. 21.Half of 164 =
  22. 22.Double 94 =
  23. 23.Double 51 =
  24. 24.Double 54 =
  25. 25.Double 82 =
  26. 26.Double 38 =
  27. 27.Double 67 =
  28. 28.Half of 88 =
  29. 29.Double 66 =
  30. 30.Double 56 =
  31. 31.Half of 80 =
  32. 32.Double 18 =
  33. 33.Double 98 =
  34. 34.Double 69 =
  35. 35.Half of 192 =
  36. 36.Half of 98 =
  37. 37.Double 37 =
  38. 38.Double 89 =
  39. 39.Double 29 =
  40. 40.Double 24 =

Answer key

  1. 54
  2. 78
  3. 24
  4. 62
  5. 39
  6. 142
  7. 61
  8. 48
  9. 62
  10. 166
  11. 14
  12. 89
  13. 15
  14. 158
  15. 98
  16. 92
  17. 44
  18. 182
  19. 194
  20. 27
  21. 82
  22. 188
  23. 102
  24. 108
  25. 164
  26. 76
  27. 134
  28. 44
  29. 132
  30. 112
  31. 40
  32. 36
  33. 196
  34. 138
  35. 96
  36. 49
  37. 74
  38. 178
  39. 58
  40. 48

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