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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 741 · 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 158 =
  2. 2.Double 21 =
  3. 3.Half of 150 =
  4. 4.Half of 62 =
  5. 5.Double 69 =
  6. 6.Double 24 =
  7. 7.Double 43 =
  8. 8.Half of 86 =
  9. 9.Half of 198 =
  10. 10.Double 67 =
  11. 11.Double 99 =
  12. 12.Double 84 =
  13. 13.Half of 114 =
  14. 14.Double 54 =
  15. 15.Half of 80 =
  16. 16.Half of 178 =
  17. 17.Double 52 =
  18. 18.Double 68 =
  19. 19.Double 96 =
  20. 20.Half of 100 =
  21. 21.Double 91 =
  22. 22.Half of 28 =
  23. 23.Half of 98 =
  24. 24.Half of 124 =
  25. 25.Double 39 =
  26. 26.Half of 136 =
  27. 27.Double 41 =
  28. 28.Half of 120 =
  29. 29.Double 81 =
  30. 30.Half of 68 =
  31. 31.Half of 38 =
  32. 32.Half of 108 =
  33. 33.Half of 156 =
  34. 34.Half of 180 =
  35. 35.Double 38 =
  36. 36.Double 31 =
  37. 37.Double 57 =
  38. 38.Double 79 =
  39. 39.Half of 104 =
  40. 40.Half of 84 =

Answer key

  1. 79
  2. 42
  3. 75
  4. 31
  5. 138
  6. 48
  7. 86
  8. 43
  9. 99
  10. 134
  11. 198
  12. 168
  13. 57
  14. 108
  15. 40
  16. 89
  17. 104
  18. 136
  19. 192
  20. 50
  21. 182
  22. 14
  23. 49
  24. 62
  25. 78
  26. 68
  27. 82
  28. 60
  29. 162
  30. 34
  31. 19
  32. 54
  33. 78
  34. 90
  35. 76
  36. 62
  37. 114
  38. 158
  39. 52
  40. 42

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