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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 405 · 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 162 =
  2. 2.Double 99 =
  3. 3.Half of 62 =
  4. 4.Double 25 =
  5. 5.Half of 146 =
  6. 6.Half of 50 =
  7. 7.Double 23 =
  8. 8.Half of 128 =
  9. 9.Double 73 =
  10. 10.Double 94 =
  11. 11.Half of 94 =
  12. 12.Half of 182 =
  13. 13.Double 31 =
  14. 14.Half of 184 =
  15. 15.Half of 78 =
  16. 16.Half of 166 =
  17. 17.Half of 198 =
  18. 18.Double 61 =
  19. 19.Double 24 =
  20. 20.Double 17 =
  21. 21.Half of 68 =
  22. 22.Half of 36 =
  23. 23.Half of 66 =
  24. 24.Half of 130 =
  25. 25.Double 74 =
  26. 26.Half of 30 =
  27. 27.Half of 88 =
  28. 28.Half of 152 =
  29. 29.Half of 42 =
  30. 30.Double 42 =
  31. 31.Double 58 =
  32. 32.Double 56 =
  33. 33.Half of 178 =
  34. 34.Double 36 =
  35. 35.Double 29 =
  36. 36.Double 47 =
  37. 37.Double 81 =
  38. 38.Double 33 =
  39. 39.Double 82 =
  40. 40.Double 84 =

Answer key

  1. 81
  2. 198
  3. 31
  4. 50
  5. 73
  6. 25
  7. 46
  8. 64
  9. 146
  10. 188
  11. 47
  12. 91
  13. 62
  14. 92
  15. 39
  16. 83
  17. 99
  18. 122
  19. 48
  20. 34
  21. 34
  22. 18
  23. 33
  24. 65
  25. 148
  26. 15
  27. 44
  28. 76
  29. 21
  30. 84
  31. 116
  32. 112
  33. 89
  34. 72
  35. 58
  36. 94
  37. 162
  38. 66
  39. 164
  40. 168

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