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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 283 · 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 52 =
  2. 2.Half of 156 =
  3. 3.Half of 66 =
  4. 4.Half of 194 =
  5. 5.Double 83 =
  6. 6.Half of 134 =
  7. 7.Half of 98 =
  8. 8.Half of 58 =
  9. 9.Half of 60 =
  10. 10.Half of 190 =
  11. 11.Half of 28 =
  12. 12.Half of 30 =
  13. 13.Half of 164 =
  14. 14.Double 34 =
  15. 15.Double 61 =
  16. 16.Half of 36 =
  17. 17.Half of 104 =
  18. 18.Half of 68 =
  19. 19.Double 28 =
  20. 20.Half of 78 =
  21. 21.Half of 150 =
  22. 22.Half of 102 =
  23. 23.Half of 106 =
  24. 24.Double 82 =
  25. 25.Half of 64 =
  26. 26.Half of 122 =
  27. 27.Double 68 =
  28. 28.Half of 192 =
  29. 29.Double 26 =
  30. 30.Half of 88 =
  31. 31.Double 39 =
  32. 32.Double 38 =
  33. 33.Double 64 =
  34. 34.Half of 130 =
  35. 35.Double 51 =
  36. 36.Half of 138 =
  37. 37.Double 69 =
  38. 38.Half of 72 =
  39. 39.Double 25 =
  40. 40.Half of 42 =

Answer key

  1. 26
  2. 78
  3. 33
  4. 97
  5. 166
  6. 67
  7. 49
  8. 29
  9. 30
  10. 95
  11. 14
  12. 15
  13. 82
  14. 68
  15. 122
  16. 18
  17. 52
  18. 34
  19. 56
  20. 39
  21. 75
  22. 51
  23. 53
  24. 164
  25. 32
  26. 61
  27. 136
  28. 96
  29. 52
  30. 44
  31. 78
  32. 76
  33. 128
  34. 65
  35. 102
  36. 69
  37. 138
  38. 36
  39. 50
  40. 21

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