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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 284 · 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 86 =
  2. 2.Half of 88 =
  3. 3.Double 21 =
  4. 4.Double 41 =
  5. 5.Half of 74 =
  6. 6.Double 61 =
  7. 7.Half of 62 =
  8. 8.Half of 102 =
  9. 9.Double 53 =
  10. 10.Double 28 =
  11. 11.Half of 188 =
  12. 12.Half of 122 =
  13. 13.Double 83 =
  14. 14.Double 81 =
  15. 15.Double 74 =
  16. 16.Double 65 =
  17. 17.Half of 170 =
  18. 18.Double 89 =
  19. 19.Double 45 =
  20. 20.Half of 186 =
  21. 21.Half of 134 =
  22. 22.Half of 190 =
  23. 23.Double 43 =
  24. 24.Half of 194 =
  25. 25.Double 76 =
  26. 26.Double 77 =
  27. 27.Double 31 =
  28. 28.Half of 130 =
  29. 29.Double 36 =
  30. 30.Half of 152 =
  31. 31.Double 51 =
  32. 32.Double 22 =
  33. 33.Half of 106 =
  34. 34.Half of 174 =
  35. 35.Double 99 =
  36. 36.Double 55 =
  37. 37.Half of 34 =
  38. 38.Half of 70 =
  39. 39.Double 95 =
  40. 40.Half of 28 =

Answer key

  1. 43
  2. 44
  3. 42
  4. 82
  5. 37
  6. 122
  7. 31
  8. 51
  9. 106
  10. 56
  11. 94
  12. 61
  13. 166
  14. 162
  15. 148
  16. 130
  17. 85
  18. 178
  19. 90
  20. 93
  21. 67
  22. 95
  23. 86
  24. 97
  25. 152
  26. 154
  27. 62
  28. 65
  29. 72
  30. 76
  31. 102
  32. 44
  33. 53
  34. 87
  35. 198
  36. 110
  37. 17
  38. 35
  39. 190
  40. 14

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