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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 315 · 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 40 =
  3. 3.Half of 82 =
  4. 4.Double 92 =
  5. 5.Double 25 =
  6. 6.Double 21 =
  7. 7.Double 87 =
  8. 8.Double 69 =
  9. 9.Double 94 =
  10. 10.Half of 72 =
  11. 11.Half of 78 =
  12. 12.Double 37 =
  13. 13.Double 91 =
  14. 14.Half of 106 =
  15. 15.Half of 28 =
  16. 16.Half of 76 =
  17. 17.Half of 134 =
  18. 18.Double 52 =
  19. 19.Half of 84 =
  20. 20.Double 56 =
  21. 21.Double 63 =
  22. 22.Half of 162 =
  23. 23.Half of 140 =
  24. 24.Half of 26 =
  25. 25.Half of 166 =
  26. 26.Half of 48 =
  27. 27.Double 39 =
  28. 28.Double 23 =
  29. 29.Half of 68 =
  30. 30.Double 18 =
  31. 31.Double 41 =
  32. 32.Half of 176 =
  33. 33.Double 71 =
  34. 34.Double 77 =
  35. 35.Double 65 =
  36. 36.Double 29 =
  37. 37.Double 17 =
  38. 38.Half of 80 =
  39. 39.Double 78 =
  40. 40.Double 35 =

Answer key

  1. 93
  2. 20
  3. 41
  4. 184
  5. 50
  6. 42
  7. 174
  8. 138
  9. 188
  10. 36
  11. 39
  12. 74
  13. 182
  14. 53
  15. 14
  16. 38
  17. 67
  18. 104
  19. 42
  20. 112
  21. 126
  22. 81
  23. 70
  24. 13
  25. 83
  26. 24
  27. 78
  28. 46
  29. 34
  30. 36
  31. 82
  32. 88
  33. 142
  34. 154
  35. 130
  36. 58
  37. 34
  38. 40
  39. 156
  40. 70

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