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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 390 · 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 59 =
  2. 2.Half of 112 =
  3. 3.Double 39 =
  4. 4.Double 77 =
  5. 5.Double 79 =
  6. 6.Double 21 =
  7. 7.Half of 168 =
  8. 8.Double 22 =
  9. 9.Double 54 =
  10. 10.Half of 28 =
  11. 11.Half of 166 =
  12. 12.Half of 102 =
  13. 13.Double 61 =
  14. 14.Double 48 =
  15. 15.Double 71 =
  16. 16.Double 41 =
  17. 17.Double 33 =
  18. 18.Double 91 =
  19. 19.Half of 190 =
  20. 20.Double 49 =
  21. 21.Half of 98 =
  22. 22.Double 53 =
  23. 23.Half of 100 =
  24. 24.Half of 192 =
  25. 25.Half of 160 =
  26. 26.Half of 84 =
  27. 27.Double 43 =
  28. 28.Double 67 =
  29. 29.Double 47 =
  30. 30.Double 19 =
  31. 31.Half of 36 =
  32. 32.Half of 130 =
  33. 33.Double 89 =
  34. 34.Double 18 =
  35. 35.Half of 64 =
  36. 36.Half of 82 =
  37. 37.Double 57 =
  38. 38.Half of 162 =
  39. 39.Half of 124 =
  40. 40.Double 69 =

Answer key

  1. 118
  2. 56
  3. 78
  4. 154
  5. 158
  6. 42
  7. 84
  8. 44
  9. 108
  10. 14
  11. 83
  12. 51
  13. 122
  14. 96
  15. 142
  16. 82
  17. 66
  18. 182
  19. 95
  20. 98
  21. 49
  22. 106
  23. 50
  24. 96
  25. 80
  26. 42
  27. 86
  28. 134
  29. 94
  30. 38
  31. 18
  32. 65
  33. 178
  34. 36
  35. 32
  36. 41
  37. 114
  38. 81
  39. 62
  40. 138

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