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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 111 · 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 82 =
  2. 2.Half of 166 =
  3. 3.Half of 152 =
  4. 4.Half of 100 =
  5. 5.Half of 34 =
  6. 6.Half of 62 =
  7. 7.Half of 134 =
  8. 8.Half of 188 =
  9. 9.Half of 192 =
  10. 10.Double 74 =
  11. 11.Half of 46 =
  12. 12.Double 37 =
  13. 13.Double 97 =
  14. 14.Double 49 =
  15. 15.Double 91 =
  16. 16.Half of 96 =
  17. 17.Double 24 =
  18. 18.Half of 130 =
  19. 19.Double 82 =
  20. 20.Half of 84 =
  21. 21.Half of 28 =
  22. 22.Half of 74 =
  23. 23.Double 33 =
  24. 24.Half of 162 =
  25. 25.Half of 198 =
  26. 26.Half of 44 =
  27. 27.Double 46 =
  28. 28.Double 81 =
  29. 29.Half of 66 =
  30. 30.Half of 30 =
  31. 31.Double 42 =
  32. 32.Double 58 =
  33. 33.Half of 70 =
  34. 34.Double 89 =
  35. 35.Double 38 =
  36. 36.Double 26 =
  37. 37.Double 39 =
  38. 38.Double 59 =
  39. 39.Double 45 =
  40. 40.Double 86 =

Answer key

  1. 41
  2. 83
  3. 76
  4. 50
  5. 17
  6. 31
  7. 67
  8. 94
  9. 96
  10. 148
  11. 23
  12. 74
  13. 194
  14. 98
  15. 182
  16. 48
  17. 48
  18. 65
  19. 164
  20. 42
  21. 14
  22. 37
  23. 66
  24. 81
  25. 99
  26. 22
  27. 92
  28. 162
  29. 33
  30. 15
  31. 84
  32. 116
  33. 35
  34. 178
  35. 76
  36. 52
  37. 78
  38. 118
  39. 90
  40. 172

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