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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 577 · 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 122 =
  2. 2.Double 18 =
  3. 3.Half of 166 =
  4. 4.Double 95 =
  5. 5.Double 55 =
  6. 6.Double 93 =
  7. 7.Half of 144 =
  8. 8.Half of 62 =
  9. 9.Half of 46 =
  10. 10.Half of 40 =
  11. 11.Double 37 =
  12. 12.Half of 134 =
  13. 13.Double 51 =
  14. 14.Half of 54 =
  15. 15.Double 99 =
  16. 16.Double 27 =
  17. 17.Half of 182 =
  18. 18.Double 73 =
  19. 19.Half of 158 =
  20. 20.Half of 36 =
  21. 21.Half of 28 =
  22. 22.Double 82 =
  23. 23.Double 19 =
  24. 24.Double 78 =
  25. 25.Double 49 =
  26. 26.Double 77 =
  27. 27.Double 22 =
  28. 28.Half of 156 =
  29. 29.Double 16 =
  30. 30.Double 75 =
  31. 31.Half of 114 =
  32. 32.Double 79 =
  33. 33.Double 56 =
  34. 34.Double 54 =
  35. 35.Double 69 =
  36. 36.Double 92 =
  37. 37.Double 81 =
  38. 38.Double 41 =
  39. 39.Double 35 =
  40. 40.Half of 168 =

Answer key

  1. 61
  2. 36
  3. 83
  4. 190
  5. 110
  6. 186
  7. 72
  8. 31
  9. 23
  10. 20
  11. 74
  12. 67
  13. 102
  14. 27
  15. 198
  16. 54
  17. 91
  18. 146
  19. 79
  20. 18
  21. 14
  22. 164
  23. 38
  24. 156
  25. 98
  26. 154
  27. 44
  28. 78
  29. 32
  30. 150
  31. 57
  32. 158
  33. 112
  34. 108
  35. 138
  36. 184
  37. 162
  38. 82
  39. 70
  40. 84

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