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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 643 · 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 24 =
  2. 2.Half of 138 =
  3. 3.Half of 32 =
  4. 4.Half of 60 =
  5. 5.Half of 92 =
  6. 6.Half of 184 =
  7. 7.Half of 82 =
  8. 8.Double 65 =
  9. 9.Double 45 =
  10. 10.Double 85 =
  11. 11.Double 75 =
  12. 12.Double 76 =
  13. 13.Half of 122 =
  14. 14.Half of 44 =
  15. 15.Double 33 =
  16. 16.Double 28 =
  17. 17.Double 25 =
  18. 18.Half of 38 =
  19. 19.Double 71 =
  20. 20.Double 27 =
  21. 21.Half of 120 =
  22. 22.Half of 130 =
  23. 23.Half of 66 =
  24. 24.Half of 106 =
  25. 25.Double 92 =
  26. 26.Half of 84 =
  27. 27.Double 77 =
  28. 28.Half of 58 =
  29. 29.Double 69 =
  30. 30.Double 18 =
  31. 31.Double 41 =
  32. 32.Double 97 =
  33. 33.Double 47 =
  34. 34.Double 58 =
  35. 35.Double 64 =
  36. 36.Double 35 =
  37. 37.Double 36 =
  38. 38.Double 81 =
  39. 39.Double 93 =
  40. 40.Double 78 =

Answer key

  1. 48
  2. 69
  3. 16
  4. 30
  5. 46
  6. 92
  7. 41
  8. 130
  9. 90
  10. 170
  11. 150
  12. 152
  13. 61
  14. 22
  15. 66
  16. 56
  17. 50
  18. 19
  19. 142
  20. 54
  21. 60
  22. 65
  23. 33
  24. 53
  25. 184
  26. 42
  27. 154
  28. 29
  29. 138
  30. 36
  31. 82
  32. 194
  33. 94
  34. 116
  35. 128
  36. 70
  37. 72
  38. 162
  39. 186
  40. 156

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