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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 436 · 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 71 =
  2. 2.Half of 46 =
  3. 3.Half of 130 =
  4. 4.Double 24 =
  5. 5.Double 23 =
  6. 6.Double 29 =
  7. 7.Half of 96 =
  8. 8.Half of 186 =
  9. 9.Half of 44 =
  10. 10.Double 92 =
  11. 11.Double 36 =
  12. 12.Half of 138 =
  13. 13.Half of 34 =
  14. 14.Double 62 =
  15. 15.Half of 62 =
  16. 16.Double 21 =
  17. 17.Double 16 =
  18. 18.Half of 146 =
  19. 19.Double 89 =
  20. 20.Double 61 =
  21. 21.Half of 104 =
  22. 22.Double 86 =
  23. 23.Half of 180 =
  24. 24.Double 47 =
  25. 25.Half of 54 =
  26. 26.Half of 78 =
  27. 27.Double 18 =
  28. 28.Half of 40 =
  29. 29.Double 81 =
  30. 30.Double 56 =
  31. 31.Double 17 =
  32. 32.Half of 28 =
  33. 33.Double 38 =
  34. 34.Double 93 =
  35. 35.Double 46 =
  36. 36.Double 64 =
  37. 37.Double 82 =
  38. 38.Half of 26 =
  39. 39.Half of 48 =
  40. 40.Half of 56 =

Answer key

  1. 142
  2. 23
  3. 65
  4. 48
  5. 46
  6. 58
  7. 48
  8. 93
  9. 22
  10. 184
  11. 72
  12. 69
  13. 17
  14. 124
  15. 31
  16. 42
  17. 32
  18. 73
  19. 178
  20. 122
  21. 52
  22. 172
  23. 90
  24. 94
  25. 27
  26. 39
  27. 36
  28. 20
  29. 162
  30. 112
  31. 34
  32. 14
  33. 76
  34. 186
  35. 92
  36. 128
  37. 164
  38. 13
  39. 24
  40. 28

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