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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 630 · 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 74 =
  2. 2.Half of 76 =
  3. 3.Half of 162 =
  4. 4.Double 69 =
  5. 5.Half of 32 =
  6. 6.Double 35 =
  7. 7.Double 49 =
  8. 8.Double 92 =
  9. 9.Double 57 =
  10. 10.Double 95 =
  11. 11.Half of 56 =
  12. 12.Double 44 =
  13. 13.Double 34 =
  14. 14.Double 28 =
  15. 15.Double 23 =
  16. 16.Half of 138 =
  17. 17.Double 45 =
  18. 18.Double 83 =
  19. 19.Double 61 =
  20. 20.Half of 80 =
  21. 21.Double 41 =
  22. 22.Double 97 =
  23. 23.Half of 66 =
  24. 24.Double 89 =
  25. 25.Double 29 =
  26. 26.Double 99 =
  27. 27.Half of 106 =
  28. 28.Double 25 =
  29. 29.Double 37 =
  30. 30.Double 81 =
  31. 31.Half of 122 =
  32. 32.Half of 72 =
  33. 33.Half of 110 =
  34. 34.Double 48 =
  35. 35.Half of 60 =
  36. 36.Double 55 =
  37. 37.Half of 96 =
  38. 38.Half of 64 =
  39. 39.Half of 90 =
  40. 40.Half of 84 =

Answer key

  1. 37
  2. 38
  3. 81
  4. 138
  5. 16
  6. 70
  7. 98
  8. 184
  9. 114
  10. 190
  11. 28
  12. 88
  13. 68
  14. 56
  15. 46
  16. 69
  17. 90
  18. 166
  19. 122
  20. 40
  21. 82
  22. 194
  23. 33
  24. 178
  25. 58
  26. 198
  27. 53
  28. 50
  29. 74
  30. 162
  31. 61
  32. 36
  33. 55
  34. 96
  35. 30
  36. 110
  37. 48
  38. 32
  39. 45
  40. 42

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