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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 330 · 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 114 =
  2. 2.Double 89 =
  3. 3.Double 32 =
  4. 4.Half of 46 =
  5. 5.Half of 26 =
  6. 6.Double 52 =
  7. 7.Double 92 =
  8. 8.Half of 198 =
  9. 9.Half of 144 =
  10. 10.Double 61 =
  11. 11.Half of 40 =
  12. 12.Double 22 =
  13. 13.Half of 30 =
  14. 14.Double 37 =
  15. 15.Half of 42 =
  16. 16.Double 21 =
  17. 17.Double 75 =
  18. 18.Half of 186 =
  19. 19.Double 34 =
  20. 20.Half of 36 =
  21. 21.Half of 78 =
  22. 22.Double 25 =
  23. 23.Half of 28 =
  24. 24.Half of 90 =
  25. 25.Double 82 =
  26. 26.Double 93 =
  27. 27.Half of 172 =
  28. 28.Double 83 =
  29. 29.Double 55 =
  30. 30.Double 73 =
  31. 31.Half of 112 =
  32. 32.Half of 96 =
  33. 33.Half of 70 =
  34. 34.Double 18 =
  35. 35.Double 68 =
  36. 36.Double 69 =
  37. 37.Half of 48 =
  38. 38.Double 51 =
  39. 39.Half of 142 =
  40. 40.Half of 128 =

Answer key

  1. 57
  2. 178
  3. 64
  4. 23
  5. 13
  6. 104
  7. 184
  8. 99
  9. 72
  10. 122
  11. 20
  12. 44
  13. 15
  14. 74
  15. 21
  16. 42
  17. 150
  18. 93
  19. 68
  20. 18
  21. 39
  22. 50
  23. 14
  24. 45
  25. 164
  26. 186
  27. 86
  28. 166
  29. 110
  30. 146
  31. 56
  32. 48
  33. 35
  34. 36
  35. 136
  36. 138
  37. 24
  38. 102
  39. 71
  40. 64

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