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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 669 · 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 36 =
  2. 2.Half of 30 =
  3. 3.Double 41 =
  4. 4.Half of 82 =
  5. 5.Double 61 =
  6. 6.Half of 52 =
  7. 7.Double 17 =
  8. 8.Double 63 =
  9. 9.Double 88 =
  10. 10.Half of 54 =
  11. 11.Half of 86 =
  12. 12.Double 37 =
  13. 13.Half of 72 =
  14. 14.Double 83 =
  15. 15.Double 46 =
  16. 16.Half of 122 =
  17. 17.Half of 116 =
  18. 18.Double 38 =
  19. 19.Double 85 =
  20. 20.Double 49 =
  21. 21.Half of 58 =
  22. 22.Half of 76 =
  23. 23.Double 73 =
  24. 24.Double 94 =
  25. 25.Double 21 =
  26. 26.Half of 42 =
  27. 27.Double 33 =
  28. 28.Double 81 =
  29. 29.Double 43 =
  30. 30.Half of 84 =
  31. 31.Half of 56 =
  32. 32.Half of 132 =
  33. 33.Double 69 =
  34. 34.Double 59 =
  35. 35.Half of 114 =
  36. 36.Half of 34 =
  37. 37.Half of 48 =
  38. 38.Half of 178 =
  39. 39.Half of 62 =
  40. 40.Half of 80 =

Answer key

  1. 18
  2. 15
  3. 82
  4. 41
  5. 122
  6. 26
  7. 34
  8. 126
  9. 176
  10. 27
  11. 43
  12. 74
  13. 36
  14. 166
  15. 92
  16. 61
  17. 58
  18. 76
  19. 170
  20. 98
  21. 29
  22. 38
  23. 146
  24. 188
  25. 42
  26. 21
  27. 66
  28. 162
  29. 86
  30. 42
  31. 28
  32. 66
  33. 138
  34. 118
  35. 57
  36. 17
  37. 24
  38. 89
  39. 31
  40. 40

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