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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 205 · 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 58 =
  2. 2.Half of 162 =
  3. 3.Half of 72 =
  4. 4.Double 91 =
  5. 5.Half of 180 =
  6. 6.Half of 142 =
  7. 7.Double 43 =
  8. 8.Double 69 =
  9. 9.Double 32 =
  10. 10.Half of 82 =
  11. 11.Double 96 =
  12. 12.Half of 148 =
  13. 13.Double 64 =
  14. 14.Double 21 =
  15. 15.Double 24 =
  16. 16.Half of 164 =
  17. 17.Half of 166 =
  18. 18.Half of 122 =
  19. 19.Half of 78 =
  20. 20.Double 31 =
  21. 21.Double 88 =
  22. 22.Double 29 =
  23. 23.Half of 106 =
  24. 24.Double 81 =
  25. 25.Half of 66 =
  26. 26.Double 68 =
  27. 27.Double 73 =
  28. 28.Half of 194 =
  29. 29.Half of 42 =
  30. 30.Double 75 =
  31. 31.Double 89 =
  32. 32.Double 19 =
  33. 33.Half of 70 =
  34. 34.Double 34 =
  35. 35.Half of 74 =
  36. 36.Double 36 =
  37. 37.Double 38 =
  38. 38.Half of 124 =
  39. 39.Double 18 =
  40. 40.Double 27 =

Answer key

  1. 29
  2. 81
  3. 36
  4. 182
  5. 90
  6. 71
  7. 86
  8. 138
  9. 64
  10. 41
  11. 192
  12. 74
  13. 128
  14. 42
  15. 48
  16. 82
  17. 83
  18. 61
  19. 39
  20. 62
  21. 176
  22. 58
  23. 53
  24. 162
  25. 33
  26. 136
  27. 146
  28. 97
  29. 21
  30. 150
  31. 178
  32. 38
  33. 35
  34. 68
  35. 37
  36. 72
  37. 76
  38. 62
  39. 36
  40. 54

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