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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 505 · 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 118 =
  2. 2.Half of 120 =
  3. 3.Double 99 =
  4. 4.Double 82 =
  5. 5.Double 42 =
  6. 6.Double 66 =
  7. 7.Half of 184 =
  8. 8.Half of 158 =
  9. 9.Half of 180 =
  10. 10.Double 51 =
  11. 11.Half of 114 =
  12. 12.Double 97 =
  13. 13.Half of 112 =
  14. 14.Double 16 =
  15. 15.Double 55 =
  16. 16.Double 81 =
  17. 17.Double 67 =
  18. 18.Half of 108 =
  19. 19.Half of 144 =
  20. 20.Double 31 =
  21. 21.Half of 156 =
  22. 22.Double 47 =
  23. 23.Half of 42 =
  24. 24.Double 35 =
  25. 25.Double 17 =
  26. 26.Double 45 =
  27. 27.Double 46 =
  28. 28.Double 78 =
  29. 29.Double 69 =
  30. 30.Half of 28 =
  31. 31.Double 56 =
  32. 32.Half of 50 =
  33. 33.Half of 170 =
  34. 34.Half of 168 =
  35. 35.Half of 182 =
  36. 36.Half of 136 =
  37. 37.Double 87 =
  38. 38.Double 84 =
  39. 39.Double 76 =
  40. 40.Half of 30 =

Answer key

  1. 59
  2. 60
  3. 198
  4. 164
  5. 84
  6. 132
  7. 92
  8. 79
  9. 90
  10. 102
  11. 57
  12. 194
  13. 56
  14. 32
  15. 110
  16. 162
  17. 134
  18. 54
  19. 72
  20. 62
  21. 78
  22. 94
  23. 21
  24. 70
  25. 34
  26. 90
  27. 92
  28. 156
  29. 138
  30. 14
  31. 112
  32. 25
  33. 85
  34. 84
  35. 91
  36. 68
  37. 174
  38. 168
  39. 152
  40. 15

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