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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 667 · 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 79 =
  2. 2.Half of 74 =
  3. 3.Double 35 =
  4. 4.Half of 154 =
  5. 5.Half of 106 =
  6. 6.Double 39 =
  7. 7.Half of 28 =
  8. 8.Double 41 =
  9. 9.Double 31 =
  10. 10.Double 81 =
  11. 11.Half of 150 =
  12. 12.Half of 162 =
  13. 13.Double 63 =
  14. 14.Half of 34 =
  15. 15.Double 27 =
  16. 16.Double 95 =
  17. 17.Half of 92 =
  18. 18.Half of 48 =
  19. 19.Half of 54 =
  20. 20.Half of 178 =
  21. 21.Half of 182 =
  22. 22.Half of 152 =
  23. 23.Half of 190 =
  24. 24.Half of 146 =
  25. 25.Double 51 =
  26. 26.Half of 76 =
  27. 27.Double 73 =
  28. 28.Half of 142 =
  29. 29.Double 43 =
  30. 30.Double 82 =
  31. 31.Half of 98 =
  32. 32.Half of 68 =
  33. 33.Double 38 =
  34. 34.Double 22 =
  35. 35.Double 61 =
  36. 36.Half of 32 =
  37. 37.Double 84 =
  38. 38.Half of 70 =
  39. 39.Double 23 =
  40. 40.Double 96 =

Answer key

  1. 158
  2. 37
  3. 70
  4. 77
  5. 53
  6. 78
  7. 14
  8. 82
  9. 62
  10. 162
  11. 75
  12. 81
  13. 126
  14. 17
  15. 54
  16. 190
  17. 46
  18. 24
  19. 27
  20. 89
  21. 91
  22. 76
  23. 95
  24. 73
  25. 102
  26. 38
  27. 146
  28. 71
  29. 86
  30. 164
  31. 49
  32. 34
  33. 76
  34. 44
  35. 122
  36. 16
  37. 168
  38. 35
  39. 46
  40. 192

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