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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 418 · 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 144 =
  2. 2.Double 31 =
  3. 3.Double 59 =
  4. 4.Half of 170 =
  5. 5.Double 93 =
  6. 6.Half of 80 =
  7. 7.Half of 168 =
  8. 8.Double 61 =
  9. 9.Half of 70 =
  10. 10.Double 26 =
  11. 11.Half of 182 =
  12. 12.Double 62 =
  13. 13.Half of 50 =
  14. 14.Double 44 =
  15. 15.Half of 108 =
  16. 16.Double 67 =
  17. 17.Half of 62 =
  18. 18.Double 16 =
  19. 19.Half of 132 =
  20. 20.Half of 42 =
  21. 21.Half of 28 =
  22. 22.Half of 48 =
  23. 23.Double 39 =
  24. 24.Half of 40 =
  25. 25.Half of 106 =
  26. 26.Double 27 =
  27. 27.Double 25 =
  28. 28.Half of 146 =
  29. 29.Double 21 =
  30. 30.Half of 160 =
  31. 31.Double 81 =
  32. 32.Half of 74 =
  33. 33.Double 83 =
  34. 34.Double 89 =
  35. 35.Double 75 =
  36. 36.Double 58 =
  37. 37.Double 98 =
  38. 38.Half of 82 =
  39. 39.Half of 46 =
  40. 40.Half of 64 =

Answer key

  1. 72
  2. 62
  3. 118
  4. 85
  5. 186
  6. 40
  7. 84
  8. 122
  9. 35
  10. 52
  11. 91
  12. 124
  13. 25
  14. 88
  15. 54
  16. 134
  17. 31
  18. 32
  19. 66
  20. 21
  21. 14
  22. 24
  23. 78
  24. 20
  25. 53
  26. 54
  27. 50
  28. 73
  29. 42
  30. 80
  31. 162
  32. 37
  33. 166
  34. 178
  35. 150
  36. 116
  37. 196
  38. 41
  39. 23
  40. 32

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