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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 356 · 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 85 =
  2. 2.Half of 182 =
  3. 3.Double 39 =
  4. 4.Double 68 =
  5. 5.Half of 86 =
  6. 6.Half of 76 =
  7. 7.Half of 56 =
  8. 8.Double 77 =
  9. 9.Half of 84 =
  10. 10.Half of 144 =
  11. 11.Double 19 =
  12. 12.Double 93 =
  13. 13.Half of 58 =
  14. 14.Half of 82 =
  15. 15.Double 81 =
  16. 16.Double 48 =
  17. 17.Double 64 =
  18. 18.Double 91 =
  19. 19.Half of 196 =
  20. 20.Half of 136 =
  21. 21.Half of 128 =
  22. 22.Half of 30 =
  23. 23.Half of 48 =
  24. 24.Double 94 =
  25. 25.Half of 134 =
  26. 26.Double 32 =
  27. 27.Double 18 =
  28. 28.Half of 168 =
  29. 29.Double 51 =
  30. 30.Double 34 =
  31. 31.Double 79 =
  32. 32.Half of 152 =
  33. 33.Double 44 =
  34. 34.Double 57 =
  35. 35.Half of 160 =
  36. 36.Half of 72 =
  37. 37.Double 83 =
  38. 38.Double 63 =
  39. 39.Half of 170 =
  40. 40.Double 37 =

Answer key

  1. 170
  2. 91
  3. 78
  4. 136
  5. 43
  6. 38
  7. 28
  8. 154
  9. 42
  10. 72
  11. 38
  12. 186
  13. 29
  14. 41
  15. 162
  16. 96
  17. 128
  18. 182
  19. 98
  20. 68
  21. 64
  22. 15
  23. 24
  24. 188
  25. 67
  26. 64
  27. 36
  28. 84
  29. 102
  30. 68
  31. 158
  32. 76
  33. 88
  34. 114
  35. 80
  36. 36
  37. 166
  38. 126
  39. 85
  40. 74

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