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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 184 · 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 39 =
  2. 2.Half of 166 =
  3. 3.Double 31 =
  4. 4.Half of 34 =
  5. 5.Double 97 =
  6. 6.Half of 198 =
  7. 7.Half of 108 =
  8. 8.Double 88 =
  9. 9.Double 37 =
  10. 10.Double 81 =
  11. 11.Double 75 =
  12. 12.Half of 168 =
  13. 13.Double 45 =
  14. 14.Double 26 =
  15. 15.Half of 176 =
  16. 16.Half of 48 =
  17. 17.Double 29 =
  18. 18.Half of 38 =
  19. 19.Half of 78 =
  20. 20.Half of 112 =
  21. 21.Half of 122 =
  22. 22.Double 64 =
  23. 23.Half of 134 =
  24. 24.Half of 84 =
  25. 25.Half of 80 =
  26. 26.Half of 120 =
  27. 27.Double 71 =
  28. 28.Half of 152 =
  29. 29.Double 76 =
  30. 30.Half of 68 =
  31. 31.Half of 26 =
  32. 32.Double 42 =
  33. 33.Half of 94 =
  34. 34.Double 41 =
  35. 35.Double 95 =
  36. 36.Half of 116 =
  37. 37.Half of 146 =
  38. 38.Double 89 =
  39. 39.Half of 118 =
  40. 40.Double 21 =

Answer key

  1. 78
  2. 83
  3. 62
  4. 17
  5. 194
  6. 99
  7. 54
  8. 176
  9. 74
  10. 162
  11. 150
  12. 84
  13. 90
  14. 52
  15. 88
  16. 24
  17. 58
  18. 19
  19. 39
  20. 56
  21. 61
  22. 128
  23. 67
  24. 42
  25. 40
  26. 60
  27. 142
  28. 76
  29. 152
  30. 34
  31. 13
  32. 84
  33. 47
  34. 82
  35. 190
  36. 58
  37. 73
  38. 178
  39. 59
  40. 42

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