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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 28 · 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 85 =
  2. 2.Double 71 =
  3. 3.Half of 74 =
  4. 4.Double 34 =
  5. 5.Half of 194 =
  6. 6.Double 37 =
  7. 7.Double 91 =
  8. 8.Double 96 =
  9. 9.Half of 106 =
  10. 10.Half of 100 =
  11. 11.Half of 192 =
  12. 12.Double 83 =
  13. 13.Double 33 =
  14. 14.Double 87 =
  15. 15.Double 53 =
  16. 16.Double 51 =
  17. 17.Double 58 =
  18. 18.Double 45 =
  19. 19.Double 16 =
  20. 20.Half of 60 =
  21. 21.Half of 188 =
  22. 22.Half of 152 =
  23. 23.Half of 180 =
  24. 24.Double 25 =
  25. 25.Double 23 =
  26. 26.Double 78 =
  27. 27.Double 28 =
  28. 28.Half of 154 =
  29. 29.Half of 164 =
  30. 30.Half of 68 =
  31. 31.Double 36 =
  32. 32.Double 29 =
  33. 33.Double 95 =
  34. 34.Half of 158 =
  35. 35.Half of 80 =
  36. 36.Half of 56 =
  37. 37.Double 22 =
  38. 38.Half of 136 =
  39. 39.Half of 108 =
  40. 40.Half of 76 =

Answer key

  1. 170
  2. 142
  3. 37
  4. 68
  5. 97
  6. 74
  7. 182
  8. 192
  9. 53
  10. 50
  11. 96
  12. 166
  13. 66
  14. 174
  15. 106
  16. 102
  17. 116
  18. 90
  19. 32
  20. 30
  21. 94
  22. 76
  23. 90
  24. 50
  25. 46
  26. 156
  27. 56
  28. 77
  29. 82
  30. 34
  31. 72
  32. 58
  33. 190
  34. 79
  35. 40
  36. 28
  37. 44
  38. 68
  39. 54
  40. 38

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