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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 789 · 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 132 =
  2. 2.Half of 90 =
  3. 3.Double 81 =
  4. 4.Double 99 =
  5. 5.Double 96 =
  6. 6.Half of 66 =
  7. 7.Double 77 =
  8. 8.Half of 76 =
  9. 9.Half of 56 =
  10. 10.Double 61 =
  11. 11.Double 51 =
  12. 12.Half of 198 =
  13. 13.Half of 134 =
  14. 14.Double 17 =
  15. 15.Double 37 =
  16. 16.Double 38 =
  17. 17.Half of 58 =
  18. 18.Double 24 =
  19. 19.Half of 170 =
  20. 20.Double 34 =
  21. 21.Double 22 =
  22. 22.Double 31 =
  23. 23.Double 42 =
  24. 24.Double 93 =
  25. 25.Double 55 =
  26. 26.Half of 140 =
  27. 27.Half of 86 =
  28. 28.Double 28 =
  29. 29.Half of 122 =
  30. 30.Double 53 =
  31. 31.Double 63 =
  32. 32.Double 39 =
  33. 33.Half of 80 =
  34. 34.Half of 82 =
  35. 35.Double 79 =
  36. 36.Double 82 =
  37. 37.Half of 52 =
  38. 38.Double 76 =
  39. 39.Half of 128 =
  40. 40.Double 75 =

Answer key

  1. 66
  2. 45
  3. 162
  4. 198
  5. 192
  6. 33
  7. 154
  8. 38
  9. 28
  10. 122
  11. 102
  12. 99
  13. 67
  14. 34
  15. 74
  16. 76
  17. 29
  18. 48
  19. 85
  20. 68
  21. 44
  22. 62
  23. 84
  24. 186
  25. 110
  26. 70
  27. 43
  28. 56
  29. 61
  30. 106
  31. 126
  32. 78
  33. 40
  34. 41
  35. 158
  36. 164
  37. 26
  38. 152
  39. 64
  40. 150

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