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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 739 · 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 42 =
  2. 2.Half of 60 =
  3. 3.Double 29 =
  4. 4.Half of 80 =
  5. 5.Half of 76 =
  6. 6.Double 31 =
  7. 7.Half of 36 =
  8. 8.Double 51 =
  9. 9.Half of 110 =
  10. 10.Half of 158 =
  11. 11.Half of 112 =
  12. 12.Half of 170 =
  13. 13.Double 68 =
  14. 14.Double 84 =
  15. 15.Double 87 =
  16. 16.Double 28 =
  17. 17.Double 88 =
  18. 18.Half of 94 =
  19. 19.Half of 114 =
  20. 20.Double 42 =
  21. 21.Half of 138 =
  22. 22.Half of 136 =
  23. 23.Double 21 =
  24. 24.Half of 48 =
  25. 25.Half of 120 =
  26. 26.Half of 88 =
  27. 27.Half of 74 =
  28. 28.Half of 28 =
  29. 29.Double 83 =
  30. 30.Half of 72 =
  31. 31.Half of 82 =
  32. 32.Half of 84 =
  33. 33.Double 17 =
  34. 34.Half of 50 =
  35. 35.Half of 194 =
  36. 36.Half of 52 =
  37. 37.Double 57 =
  38. 38.Half of 126 =
  39. 39.Double 81 =
  40. 40.Half of 176 =

Answer key

  1. 21
  2. 30
  3. 58
  4. 40
  5. 38
  6. 62
  7. 18
  8. 102
  9. 55
  10. 79
  11. 56
  12. 85
  13. 136
  14. 168
  15. 174
  16. 56
  17. 176
  18. 47
  19. 57
  20. 84
  21. 69
  22. 68
  23. 42
  24. 24
  25. 60
  26. 44
  27. 37
  28. 14
  29. 166
  30. 36
  31. 41
  32. 42
  33. 34
  34. 25
  35. 97
  36. 26
  37. 114
  38. 63
  39. 162
  40. 88

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