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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 376 · 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 48 =
  2. 2.Double 26 =
  3. 3.Half of 82 =
  4. 4.Half of 114 =
  5. 5.Half of 74 =
  6. 6.Double 23 =
  7. 7.Double 24 =
  8. 8.Half of 106 =
  9. 9.Double 19 =
  10. 10.Double 85 =
  11. 11.Half of 26 =
  12. 12.Half of 196 =
  13. 13.Double 96 =
  14. 14.Double 71 =
  15. 15.Double 56 =
  16. 16.Half of 50 =
  17. 17.Half of 28 =
  18. 18.Half of 84 =
  19. 19.Double 89 =
  20. 20.Half of 138 =
  21. 21.Double 93 =
  22. 22.Double 78 =
  23. 23.Half of 66 =
  24. 24.Double 25 =
  25. 25.Half of 90 =
  26. 26.Half of 142 =
  27. 27.Half of 168 =
  28. 28.Half of 156 =
  29. 29.Double 69 =
  30. 30.Half of 30 =
  31. 31.Double 66 =
  32. 32.Half of 116 =
  33. 33.Double 74 =
  34. 34.Double 22 =
  35. 35.Half of 100 =
  36. 36.Double 61 =
  37. 37.Double 18 =
  38. 38.Half of 72 =
  39. 39.Half of 54 =
  40. 40.Double 35 =

Answer key

  1. 96
  2. 52
  3. 41
  4. 57
  5. 37
  6. 46
  7. 48
  8. 53
  9. 38
  10. 170
  11. 13
  12. 98
  13. 192
  14. 142
  15. 112
  16. 25
  17. 14
  18. 42
  19. 178
  20. 69
  21. 186
  22. 156
  23. 33
  24. 50
  25. 45
  26. 71
  27. 84
  28. 78
  29. 138
  30. 15
  31. 132
  32. 58
  33. 148
  34. 44
  35. 50
  36. 122
  37. 36
  38. 36
  39. 27
  40. 70

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