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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 534 · 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 95 =
  2. 2.Double 37 =
  3. 3.Double 91 =
  4. 4.Half of 142 =
  5. 5.Half of 60 =
  6. 6.Double 25 =
  7. 7.Double 99 =
  8. 8.Double 22 =
  9. 9.Half of 122 =
  10. 10.Half of 166 =
  11. 11.Double 56 =
  12. 12.Half of 66 =
  13. 13.Double 78 =
  14. 14.Double 36 =
  15. 15.Double 45 =
  16. 16.Double 59 =
  17. 17.Double 61 =
  18. 18.Half of 186 =
  19. 19.Double 23 =
  20. 20.Half of 40 =
  21. 21.Double 76 =
  22. 22.Half of 184 =
  23. 23.Half of 176 =
  24. 24.Half of 188 =
  25. 25.Double 17 =
  26. 26.Double 34 =
  27. 27.Double 79 =
  28. 28.Half of 36 =
  29. 29.Half of 154 =
  30. 30.Half of 136 =
  31. 31.Double 31 =
  32. 32.Double 57 =
  33. 33.Double 54 =
  34. 34.Half of 106 =
  35. 35.Double 21 =
  36. 36.Double 84 =
  37. 37.Half of 44 =
  38. 38.Half of 132 =
  39. 39.Double 47 =
  40. 40.Half of 34 =

Answer key

  1. 190
  2. 74
  3. 182
  4. 71
  5. 30
  6. 50
  7. 198
  8. 44
  9. 61
  10. 83
  11. 112
  12. 33
  13. 156
  14. 72
  15. 90
  16. 118
  17. 122
  18. 93
  19. 46
  20. 20
  21. 152
  22. 92
  23. 88
  24. 94
  25. 34
  26. 68
  27. 158
  28. 18
  29. 77
  30. 68
  31. 62
  32. 114
  33. 108
  34. 53
  35. 42
  36. 168
  37. 22
  38. 66
  39. 94
  40. 17

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