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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 584 · 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 18 =
  2. 2.Half of 26 =
  3. 3.Double 85 =
  4. 4.Half of 188 =
  5. 5.Half of 58 =
  6. 6.Half of 48 =
  7. 7.Double 75 =
  8. 8.Double 89 =
  9. 9.Double 22 =
  10. 10.Double 71 =
  11. 11.Half of 54 =
  12. 12.Double 34 =
  13. 13.Half of 56 =
  14. 14.Double 35 =
  15. 15.Double 96 =
  16. 16.Half of 128 =
  17. 17.Half of 198 =
  18. 18.Half of 130 =
  19. 19.Half of 36 =
  20. 20.Half of 76 =
  21. 21.Half of 84 =
  22. 22.Double 61 =
  23. 23.Double 63 =
  24. 24.Double 41 =
  25. 25.Half of 46 =
  26. 26.Double 55 =
  27. 27.Half of 192 =
  28. 28.Double 51 =
  29. 29.Half of 44 =
  30. 30.Half of 62 =
  31. 31.Half of 68 =
  32. 32.Double 29 =
  33. 33.Half of 182 =
  34. 34.Half of 120 =
  35. 35.Double 83 =
  36. 36.Half of 158 =
  37. 37.Half of 108 =
  38. 38.Double 65 =
  39. 39.Double 91 =
  40. 40.Double 78 =

Answer key

  1. 36
  2. 13
  3. 170
  4. 94
  5. 29
  6. 24
  7. 150
  8. 178
  9. 44
  10. 142
  11. 27
  12. 68
  13. 28
  14. 70
  15. 192
  16. 64
  17. 99
  18. 65
  19. 18
  20. 38
  21. 42
  22. 122
  23. 126
  24. 82
  25. 23
  26. 110
  27. 96
  28. 102
  29. 22
  30. 31
  31. 34
  32. 58
  33. 91
  34. 60
  35. 166
  36. 79
  37. 54
  38. 130
  39. 182
  40. 156

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