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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 240 · 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 72 =
  2. 2.Half of 94 =
  3. 3.Half of 40 =
  4. 4.Half of 180 =
  5. 5.Half of 132 =
  6. 6.Half of 34 =
  7. 7.Double 95 =
  8. 8.Half of 82 =
  9. 9.Double 57 =
  10. 10.Half of 156 =
  11. 11.Double 56 =
  12. 12.Double 28 =
  13. 13.Half of 52 =
  14. 14.Half of 142 =
  15. 15.Half of 36 =
  16. 16.Double 21 =
  17. 17.Half of 64 =
  18. 18.Half of 118 =
  19. 19.Double 41 =
  20. 20.Double 34 =
  21. 21.Double 19 =
  22. 22.Half of 74 =
  23. 23.Half of 56 =
  24. 24.Double 71 =
  25. 25.Double 52 =
  26. 26.Half of 62 =
  27. 27.Half of 184 =
  28. 28.Half of 144 =
  29. 29.Double 26 =
  30. 30.Half of 54 =
  31. 31.Double 51 =
  32. 32.Half of 160 =
  33. 33.Half of 68 =
  34. 34.Double 59 =
  35. 35.Double 25 =
  36. 36.Half of 138 =
  37. 37.Half of 122 =
  38. 38.Double 77 =
  39. 39.Double 36 =
  40. 40.Half of 70 =

Answer key

  1. 144
  2. 47
  3. 20
  4. 90
  5. 66
  6. 17
  7. 190
  8. 41
  9. 114
  10. 78
  11. 112
  12. 56
  13. 26
  14. 71
  15. 18
  16. 42
  17. 32
  18. 59
  19. 82
  20. 68
  21. 38
  22. 37
  23. 28
  24. 142
  25. 104
  26. 31
  27. 92
  28. 72
  29. 52
  30. 27
  31. 102
  32. 80
  33. 34
  34. 118
  35. 50
  36. 69
  37. 61
  38. 154
  39. 72
  40. 35

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