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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 575 · 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 34 =
  2. 2.Half of 38 =
  3. 3.Half of 178 =
  4. 4.Double 81 =
  5. 5.Half of 82 =
  6. 6.Double 33 =
  7. 7.Double 36 =
  8. 8.Double 79 =
  9. 9.Double 31 =
  10. 10.Double 89 =
  11. 11.Double 84 =
  12. 12.Double 18 =
  13. 13.Half of 162 =
  14. 14.Double 75 =
  15. 15.Half of 144 =
  16. 16.Half of 180 =
  17. 17.Half of 196 =
  18. 18.Half of 70 =
  19. 19.Double 71 =
  20. 20.Half of 140 =
  21. 21.Double 41 =
  22. 22.Double 25 =
  23. 23.Half of 54 =
  24. 24.Half of 194 =
  25. 25.Double 82 =
  26. 26.Double 56 =
  27. 27.Half of 100 =
  28. 28.Double 91 =
  29. 29.Double 26 =
  30. 30.Half of 66 =
  31. 31.Double 52 =
  32. 32.Half of 62 =
  33. 33.Double 28 =
  34. 34.Double 27 =
  35. 35.Half of 50 =
  36. 36.Half of 68 =
  37. 37.Half of 72 =
  38. 38.Half of 134 =
  39. 39.Half of 30 =
  40. 40.Half of 88 =

Answer key

  1. 17
  2. 19
  3. 89
  4. 162
  5. 41
  6. 66
  7. 72
  8. 158
  9. 62
  10. 178
  11. 168
  12. 36
  13. 81
  14. 150
  15. 72
  16. 90
  17. 98
  18. 35
  19. 142
  20. 70
  21. 82
  22. 50
  23. 27
  24. 97
  25. 164
  26. 112
  27. 50
  28. 182
  29. 52
  30. 33
  31. 104
  32. 31
  33. 56
  34. 54
  35. 25
  36. 34
  37. 36
  38. 67
  39. 15
  40. 44

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