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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 157 · 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 66 =
  2. 2.Half of 124 =
  3. 3.Half of 156 =
  4. 4.Double 96 =
  5. 5.Half of 60 =
  6. 6.Double 92 =
  7. 7.Double 37 =
  8. 8.Double 67 =
  9. 9.Half of 176 =
  10. 10.Half of 84 =
  11. 11.Double 74 =
  12. 12.Double 94 =
  13. 13.Double 38 =
  14. 14.Half of 100 =
  15. 15.Half of 48 =
  16. 16.Half of 138 =
  17. 17.Double 99 =
  18. 18.Double 19 =
  19. 19.Half of 136 =
  20. 20.Double 58 =
  21. 21.Half of 106 =
  22. 22.Double 61 =
  23. 23.Half of 68 =
  24. 24.Double 62 =
  25. 25.Double 65 =
  26. 26.Double 45 =
  27. 27.Half of 116 =
  28. 28.Half of 142 =
  29. 29.Half of 76 =
  30. 30.Double 79 =
  31. 31.Half of 180 =
  32. 32.Double 31 =
  33. 33.Half of 104 =
  34. 34.Half of 56 =
  35. 35.Half of 88 =
  36. 36.Half of 50 =
  37. 37.Half of 82 =
  38. 38.Half of 58 =
  39. 39.Double 71 =
  40. 40.Double 54 =

Answer key

  1. 33
  2. 62
  3. 78
  4. 192
  5. 30
  6. 184
  7. 74
  8. 134
  9. 88
  10. 42
  11. 148
  12. 188
  13. 76
  14. 50
  15. 24
  16. 69
  17. 198
  18. 38
  19. 68
  20. 116
  21. 53
  22. 122
  23. 34
  24. 124
  25. 130
  26. 90
  27. 58
  28. 71
  29. 38
  30. 158
  31. 90
  32. 62
  33. 52
  34. 28
  35. 44
  36. 25
  37. 41
  38. 29
  39. 142
  40. 108

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