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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 383 · 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 23 =
  2. 2.Half of 48 =
  3. 3.Half of 46 =
  4. 4.Half of 126 =
  5. 5.Half of 160 =
  6. 6.Double 17 =
  7. 7.Double 76 =
  8. 8.Double 41 =
  9. 9.Half of 156 =
  10. 10.Double 92 =
  11. 11.Double 96 =
  12. 12.Half of 142 =
  13. 13.Half of 78 =
  14. 14.Double 43 =
  15. 15.Double 31 =
  16. 16.Half of 192 =
  17. 17.Half of 58 =
  18. 18.Half of 172 =
  19. 19.Half of 82 =
  20. 20.Half of 106 =
  21. 21.Double 66 =
  22. 22.Double 78 =
  23. 23.Half of 136 =
  24. 24.Double 83 =
  25. 25.Half of 180 =
  26. 26.Half of 92 =
  27. 27.Double 49 =
  28. 28.Half of 120 =
  29. 29.Double 46 =
  30. 30.Half of 166 =
  31. 31.Half of 154 =
  32. 32.Half of 44 =
  33. 33.Half of 28 =
  34. 34.Double 97 =
  35. 35.Half of 170 =
  36. 36.Half of 56 =
  37. 37.Double 29 =
  38. 38.Double 18 =
  39. 39.Double 89 =
  40. 40.Double 62 =

Answer key

  1. 46
  2. 24
  3. 23
  4. 63
  5. 80
  6. 34
  7. 152
  8. 82
  9. 78
  10. 184
  11. 192
  12. 71
  13. 39
  14. 86
  15. 62
  16. 96
  17. 29
  18. 86
  19. 41
  20. 53
  21. 132
  22. 156
  23. 68
  24. 166
  25. 90
  26. 46
  27. 98
  28. 60
  29. 92
  30. 83
  31. 77
  32. 22
  33. 14
  34. 194
  35. 85
  36. 28
  37. 58
  38. 36
  39. 178
  40. 124

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