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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 52 · 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 21 =
  2. 2.Double 29 =
  3. 3.Double 35 =
  4. 4.Half of 32 =
  5. 5.Half of 142 =
  6. 6.Double 25 =
  7. 7.Half of 174 =
  8. 8.Half of 96 =
  9. 9.Half of 112 =
  10. 10.Double 55 =
  11. 11.Half of 124 =
  12. 12.Double 68 =
  13. 13.Half of 82 =
  14. 14.Half of 28 =
  15. 15.Double 82 =
  16. 16.Double 73 =
  17. 17.Half of 140 =
  18. 18.Half of 70 =
  19. 19.Half of 150 =
  20. 20.Half of 44 =
  21. 21.Half of 132 =
  22. 22.Half of 158 =
  23. 23.Half of 84 =
  24. 24.Half of 100 =
  25. 25.Half of 114 =
  26. 26.Double 42 =
  27. 27.Double 74 =
  28. 28.Double 87 =
  29. 29.Double 71 =
  30. 30.Half of 188 =
  31. 31.Half of 108 =
  32. 32.Half of 52 =
  33. 33.Half of 184 =
  34. 34.Half of 118 =
  35. 35.Double 18 =
  36. 36.Double 44 =
  37. 37.Half of 42 =
  38. 38.Double 56 =
  39. 39.Half of 106 =
  40. 40.Double 81 =

Answer key

  1. 42
  2. 58
  3. 70
  4. 16
  5. 71
  6. 50
  7. 87
  8. 48
  9. 56
  10. 110
  11. 62
  12. 136
  13. 41
  14. 14
  15. 164
  16. 146
  17. 70
  18. 35
  19. 75
  20. 22
  21. 66
  22. 79
  23. 42
  24. 50
  25. 57
  26. 84
  27. 148
  28. 174
  29. 142
  30. 94
  31. 54
  32. 26
  33. 92
  34. 59
  35. 36
  36. 88
  37. 21
  38. 112
  39. 53
  40. 162

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