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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 595 · 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 26 =
  2. 2.Double 64 =
  3. 3.Half of 180 =
  4. 4.Half of 122 =
  5. 5.Half of 34 =
  6. 6.Double 34 =
  7. 7.Double 71 =
  8. 8.Double 85 =
  9. 9.Half of 68 =
  10. 10.Half of 176 =
  11. 11.Double 61 =
  12. 12.Half of 36 =
  13. 13.Double 38 =
  14. 14.Half of 152 =
  15. 15.Half of 120 =
  16. 16.Half of 84 =
  17. 17.Double 94 =
  18. 18.Double 69 =
  19. 19.Double 81 =
  20. 20.Double 92 =
  21. 21.Double 25 =
  22. 22.Half of 132 =
  23. 23.Double 42 =
  24. 24.Half of 146 =
  25. 25.Half of 62 =
  26. 26.Double 39 =
  27. 27.Double 67 =
  28. 28.Double 32 =
  29. 29.Double 44 =
  30. 30.Half of 50 =
  31. 31.Double 21 =
  32. 32.Half of 30 =
  33. 33.Double 78 =
  34. 34.Double 17 =
  35. 35.Double 87 =
  36. 36.Double 83 =
  37. 37.Half of 162 =
  38. 38.Half of 168 =
  39. 39.Double 41 =
  40. 40.Double 84 =

Answer key

  1. 13
  2. 128
  3. 90
  4. 61
  5. 17
  6. 68
  7. 142
  8. 170
  9. 34
  10. 88
  11. 122
  12. 18
  13. 76
  14. 76
  15. 60
  16. 42
  17. 188
  18. 138
  19. 162
  20. 184
  21. 50
  22. 66
  23. 84
  24. 73
  25. 31
  26. 78
  27. 134
  28. 64
  29. 88
  30. 25
  31. 42
  32. 15
  33. 156
  34. 34
  35. 174
  36. 166
  37. 81
  38. 84
  39. 82
  40. 168

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