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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 103 · 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 186 =
  2. 2.Half of 76 =
  3. 3.Double 31 =
  4. 4.Half of 40 =
  5. 5.Double 25 =
  6. 6.Double 57 =
  7. 7.Half of 80 =
  8. 8.Half of 44 =
  9. 9.Double 69 =
  10. 10.Double 92 =
  11. 11.Half of 178 =
  12. 12.Half of 106 =
  13. 13.Double 78 =
  14. 14.Half of 188 =
  15. 15.Double 91 =
  16. 16.Half of 144 =
  17. 17.Double 42 =
  18. 18.Half of 46 =
  19. 19.Double 95 =
  20. 20.Half of 94 =
  21. 21.Double 24 =
  22. 22.Double 93 =
  23. 23.Half of 72 =
  24. 24.Half of 124 =
  25. 25.Half of 52 =
  26. 26.Double 33 =
  27. 27.Half of 156 =
  28. 28.Double 59 =
  29. 29.Half of 110 =
  30. 30.Double 36 =
  31. 31.Double 81 =
  32. 32.Double 87 =
  33. 33.Double 43 =
  34. 34.Half of 26 =
  35. 35.Half of 54 =
  36. 36.Double 61 =
  37. 37.Half of 198 =
  38. 38.Double 84 =
  39. 39.Half of 180 =
  40. 40.Half of 102 =

Answer key

  1. 93
  2. 38
  3. 62
  4. 20
  5. 50
  6. 114
  7. 40
  8. 22
  9. 138
  10. 184
  11. 89
  12. 53
  13. 156
  14. 94
  15. 182
  16. 72
  17. 84
  18. 23
  19. 190
  20. 47
  21. 48
  22. 186
  23. 36
  24. 62
  25. 26
  26. 66
  27. 78
  28. 118
  29. 55
  30. 72
  31. 162
  32. 174
  33. 86
  34. 13
  35. 27
  36. 122
  37. 99
  38. 168
  39. 90
  40. 51

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