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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 194 · 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 34 =
  2. 2.Double 71 =
  3. 3.Double 82 =
  4. 4.Half of 180 =
  5. 5.Double 94 =
  6. 6.Half of 76 =
  7. 7.Double 18 =
  8. 8.Half of 164 =
  9. 9.Double 25 =
  10. 10.Half of 34 =
  11. 11.Half of 74 =
  12. 12.Half of 198 =
  13. 13.Double 83 =
  14. 14.Half of 138 =
  15. 15.Double 89 =
  16. 16.Half of 174 =
  17. 17.Half of 62 =
  18. 18.Double 65 =
  19. 19.Half of 70 =
  20. 20.Half of 108 =
  21. 21.Half of 98 =
  22. 22.Double 81 =
  23. 23.Double 58 =
  24. 24.Half of 116 =
  25. 25.Half of 82 =
  26. 26.Double 49 =
  27. 27.Half of 188 =
  28. 28.Half of 128 =
  29. 29.Half of 126 =
  30. 30.Double 97 =
  31. 31.Half of 132 =
  32. 32.Double 46 =
  33. 33.Double 77 =
  34. 34.Double 39 =
  35. 35.Half of 100 =
  36. 36.Double 78 =
  37. 37.Double 61 =
  38. 38.Double 73 =
  39. 39.Double 99 =
  40. 40.Half of 30 =

Answer key

  1. 68
  2. 142
  3. 164
  4. 90
  5. 188
  6. 38
  7. 36
  8. 82
  9. 50
  10. 17
  11. 37
  12. 99
  13. 166
  14. 69
  15. 178
  16. 87
  17. 31
  18. 130
  19. 35
  20. 54
  21. 49
  22. 162
  23. 116
  24. 58
  25. 41
  26. 98
  27. 94
  28. 64
  29. 63
  30. 194
  31. 66
  32. 92
  33. 154
  34. 78
  35. 50
  36. 156
  37. 122
  38. 146
  39. 198
  40. 15

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