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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 204 · 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 99 =
  2. 2.Half of 68 =
  3. 3.Half of 166 =
  4. 4.Double 32 =
  5. 5.Double 25 =
  6. 6.Half of 154 =
  7. 7.Half of 170 =
  8. 8.Half of 136 =
  9. 9.Half of 78 =
  10. 10.Half of 96 =
  11. 11.Half of 88 =
  12. 12.Half of 72 =
  13. 13.Half of 52 =
  14. 14.Half of 94 =
  15. 15.Double 35 =
  16. 16.Double 45 =
  17. 17.Double 31 =
  18. 18.Double 86 =
  19. 19.Half of 190 =
  20. 20.Double 23 =
  21. 21.Half of 146 =
  22. 22.Half of 112 =
  23. 23.Half of 70 =
  24. 24.Half of 138 =
  25. 25.Double 91 =
  26. 26.Double 29 =
  27. 27.Double 95 =
  28. 28.Half of 30 =
  29. 29.Half of 84 =
  30. 30.Double 81 =
  31. 31.Half of 38 =
  32. 32.Double 17 =
  33. 33.Half of 36 =
  34. 34.Double 41 =
  35. 35.Double 42 =
  36. 36.Half of 32 =
  37. 37.Double 46 =
  38. 38.Half of 116 =
  39. 39.Double 37 =
  40. 40.Half of 54 =

Answer key

  1. 198
  2. 34
  3. 83
  4. 64
  5. 50
  6. 77
  7. 85
  8. 68
  9. 39
  10. 48
  11. 44
  12. 36
  13. 26
  14. 47
  15. 70
  16. 90
  17. 62
  18. 172
  19. 95
  20. 46
  21. 73
  22. 56
  23. 35
  24. 69
  25. 182
  26. 58
  27. 190
  28. 15
  29. 42
  30. 162
  31. 19
  32. 34
  33. 18
  34. 82
  35. 84
  36. 16
  37. 92
  38. 58
  39. 74
  40. 27

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