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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 61 · 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 33 =
  2. 2.Double 64 =
  3. 3.Half of 196 =
  4. 4.Half of 134 =
  5. 5.Double 56 =
  6. 6.Double 45 =
  7. 7.Double 57 =
  8. 8.Double 81 =
  9. 9.Double 89 =
  10. 10.Double 46 =
  11. 11.Double 34 =
  12. 12.Half of 94 =
  13. 13.Half of 150 =
  14. 14.Double 76 =
  15. 15.Double 51 =
  16. 16.Half of 40 =
  17. 17.Double 38 =
  18. 18.Double 44 =
  19. 19.Double 71 =
  20. 20.Double 42 =
  21. 21.Half of 96 =
  22. 22.Half of 34 =
  23. 23.Half of 64 =
  24. 24.Half of 28 =
  25. 25.Half of 172 =
  26. 26.Double 79 =
  27. 27.Double 77 =
  28. 28.Double 23 =
  29. 29.Half of 168 =
  30. 30.Half of 52 =
  31. 31.Half of 26 =
  32. 32.Half of 46 =
  33. 33.Half of 50 =
  34. 34.Double 28 =
  35. 35.Half of 116 =
  36. 36.Half of 54 =
  37. 37.Double 61 =
  38. 38.Double 25 =
  39. 39.Half of 128 =
  40. 40.Half of 190 =

Answer key

  1. 66
  2. 128
  3. 98
  4. 67
  5. 112
  6. 90
  7. 114
  8. 162
  9. 178
  10. 92
  11. 68
  12. 47
  13. 75
  14. 152
  15. 102
  16. 20
  17. 76
  18. 88
  19. 142
  20. 84
  21. 48
  22. 17
  23. 32
  24. 14
  25. 86
  26. 158
  27. 154
  28. 46
  29. 84
  30. 26
  31. 13
  32. 23
  33. 25
  34. 56
  35. 58
  36. 27
  37. 122
  38. 50
  39. 64
  40. 95

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