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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 173 · 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 120 =
  2. 2.Double 52 =
  3. 3.Half of 106 =
  4. 4.Half of 198 =
  5. 5.Double 25 =
  6. 6.Half of 124 =
  7. 7.Double 51 =
  8. 8.Double 34 =
  9. 9.Double 45 =
  10. 10.Double 53 =
  11. 11.Double 18 =
  12. 12.Half of 116 =
  13. 13.Half of 92 =
  14. 14.Double 99 =
  15. 15.Double 71 =
  16. 16.Double 27 =
  17. 17.Half of 72 =
  18. 18.Half of 74 =
  19. 19.Double 58 =
  20. 20.Half of 88 =
  21. 21.Half of 110 =
  22. 22.Double 41 =
  23. 23.Half of 42 =
  24. 24.Double 29 =
  25. 25.Double 38 =
  26. 26.Half of 84 =
  27. 27.Double 17 =
  28. 28.Double 47 =
  29. 29.Half of 176 =
  30. 30.Half of 50 =
  31. 31.Double 91 =
  32. 32.Double 39 =
  33. 33.Double 92 =
  34. 34.Half of 26 =
  35. 35.Half of 134 =
  36. 36.Double 81 =
  37. 37.Half of 30 =
  38. 38.Double 68 =
  39. 39.Half of 160 =
  40. 40.Half of 132 =

Answer key

  1. 60
  2. 104
  3. 53
  4. 99
  5. 50
  6. 62
  7. 102
  8. 68
  9. 90
  10. 106
  11. 36
  12. 58
  13. 46
  14. 198
  15. 142
  16. 54
  17. 36
  18. 37
  19. 116
  20. 44
  21. 55
  22. 82
  23. 21
  24. 58
  25. 76
  26. 42
  27. 34
  28. 94
  29. 88
  30. 25
  31. 182
  32. 78
  33. 184
  34. 13
  35. 67
  36. 162
  37. 15
  38. 136
  39. 80
  40. 66

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