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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 90 · 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 100 =
  2. 2.Double 36 =
  3. 3.Half of 70 =
  4. 4.Half of 140 =
  5. 5.Double 98 =
  6. 6.Half of 74 =
  7. 7.Double 61 =
  8. 8.Double 83 =
  9. 9.Double 53 =
  10. 10.Half of 44 =
  11. 11.Double 62 =
  12. 12.Half of 72 =
  13. 13.Half of 68 =
  14. 14.Half of 106 =
  15. 15.Double 87 =
  16. 16.Double 44 =
  17. 17.Half of 128 =
  18. 18.Double 75 =
  19. 19.Half of 62 =
  20. 20.Double 77 =
  21. 21.Double 25 =
  22. 22.Double 81 =
  23. 23.Half of 144 =
  24. 24.Double 71 =
  25. 25.Double 19 =
  26. 26.Half of 36 =
  27. 27.Double 93 =
  28. 28.Half of 94 =
  29. 29.Double 17 =
  30. 30.Double 26 =
  31. 31.Half of 52 =
  32. 32.Double 89 =
  33. 33.Half of 178 =
  34. 34.Half of 122 =
  35. 35.Half of 186 =
  36. 36.Double 34 =
  37. 37.Double 73 =
  38. 38.Half of 42 =
  39. 39.Half of 80 =
  40. 40.Double 33 =

Answer key

  1. 50
  2. 72
  3. 35
  4. 70
  5. 196
  6. 37
  7. 122
  8. 166
  9. 106
  10. 22
  11. 124
  12. 36
  13. 34
  14. 53
  15. 174
  16. 88
  17. 64
  18. 150
  19. 31
  20. 154
  21. 50
  22. 162
  23. 72
  24. 142
  25. 38
  26. 18
  27. 186
  28. 47
  29. 34
  30. 52
  31. 26
  32. 178
  33. 89
  34. 61
  35. 93
  36. 68
  37. 146
  38. 21
  39. 40
  40. 66

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