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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 835 · 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 60 =
  2. 2.Half of 168 =
  3. 3.Half of 70 =
  4. 4.Double 55 =
  5. 5.Double 39 =
  6. 6.Double 54 =
  7. 7.Half of 112 =
  8. 8.Double 51 =
  9. 9.Half of 94 =
  10. 10.Double 83 =
  11. 11.Half of 140 =
  12. 12.Half of 66 =
  13. 13.Double 24 =
  14. 14.Half of 110 =
  15. 15.Double 36 =
  16. 16.Half of 120 =
  17. 17.Double 31 =
  18. 18.Half of 64 =
  19. 19.Half of 78 =
  20. 20.Half of 80 =
  21. 21.Half of 106 =
  22. 22.Double 61 =
  23. 23.Half of 174 =
  24. 24.Double 77 =
  25. 25.Half of 186 =
  26. 26.Double 64 =
  27. 27.Half of 170 =
  28. 28.Double 34 =
  29. 29.Half of 38 =
  30. 30.Double 95 =
  31. 31.Double 92 =
  32. 32.Double 91 =
  33. 33.Double 41 =
  34. 34.Double 66 =
  35. 35.Half of 138 =
  36. 36.Half of 28 =
  37. 37.Double 84 =
  38. 38.Double 21 =
  39. 39.Half of 108 =
  40. 40.Half of 162 =

Answer key

  1. 30
  2. 84
  3. 35
  4. 110
  5. 78
  6. 108
  7. 56
  8. 102
  9. 47
  10. 166
  11. 70
  12. 33
  13. 48
  14. 55
  15. 72
  16. 60
  17. 62
  18. 32
  19. 39
  20. 40
  21. 53
  22. 122
  23. 87
  24. 154
  25. 93
  26. 128
  27. 85
  28. 68
  29. 19
  30. 190
  31. 184
  32. 182
  33. 82
  34. 132
  35. 69
  36. 14
  37. 168
  38. 42
  39. 54
  40. 81

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