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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 721 · 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 29 =
  2. 2.Half of 162 =
  3. 3.Half of 72 =
  4. 4.Half of 88 =
  5. 5.Double 81 =
  6. 6.Half of 110 =
  7. 7.Half of 46 =
  8. 8.Half of 122 =
  9. 9.Half of 60 =
  10. 10.Double 61 =
  11. 11.Half of 136 =
  12. 12.Double 23 =
  13. 13.Double 38 =
  14. 14.Double 83 =
  15. 15.Double 44 =
  16. 16.Double 34 =
  17. 17.Half of 34 =
  18. 18.Half of 114 =
  19. 19.Half of 166 =
  20. 20.Double 84 =
  21. 21.Double 25 =
  22. 22.Half of 138 =
  23. 23.Half of 62 =
  24. 24.Double 71 =
  25. 25.Double 73 =
  26. 26.Double 63 =
  27. 27.Double 85 =
  28. 28.Half of 64 =
  29. 29.Double 57 =
  30. 30.Double 47 =
  31. 31.Half of 196 =
  32. 32.Half of 134 =
  33. 33.Half of 80 =
  34. 34.Double 89 =
  35. 35.Double 54 =
  36. 36.Double 72 =
  37. 37.Double 18 =
  38. 38.Half of 76 =
  39. 39.Half of 126 =
  40. 40.Double 42 =

Answer key

  1. 58
  2. 81
  3. 36
  4. 44
  5. 162
  6. 55
  7. 23
  8. 61
  9. 30
  10. 122
  11. 68
  12. 46
  13. 76
  14. 166
  15. 88
  16. 68
  17. 17
  18. 57
  19. 83
  20. 168
  21. 50
  22. 69
  23. 31
  24. 142
  25. 146
  26. 126
  27. 170
  28. 32
  29. 114
  30. 94
  31. 98
  32. 67
  33. 40
  34. 178
  35. 108
  36. 144
  37. 36
  38. 38
  39. 63
  40. 84

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