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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 100 · 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 27 =
  2. 2.Half of 168 =
  3. 3.Half of 90 =
  4. 4.Double 61 =
  5. 5.Half of 172 =
  6. 6.Double 62 =
  7. 7.Half of 58 =
  8. 8.Half of 162 =
  9. 9.Half of 198 =
  10. 10.Double 38 =
  11. 11.Half of 164 =
  12. 12.Double 75 =
  13. 13.Double 18 =
  14. 14.Half of 40 =
  15. 15.Half of 34 =
  16. 16.Double 83 =
  17. 17.Double 25 =
  18. 18.Double 92 =
  19. 19.Double 71 =
  20. 20.Half of 62 =
  21. 21.Half of 36 =
  22. 22.Half of 124 =
  23. 23.Double 34 =
  24. 24.Double 47 =
  25. 25.Double 33 =
  26. 26.Half of 104 =
  27. 27.Double 41 =
  28. 28.Double 96 =
  29. 29.Half of 160 =
  30. 30.Double 66 =
  31. 31.Half of 192 =
  32. 32.Double 42 =
  33. 33.Double 78 =
  34. 34.Half of 116 =
  35. 35.Half of 48 =
  36. 36.Half of 80 =
  37. 37.Half of 98 =
  38. 38.Double 77 =
  39. 39.Half of 46 =
  40. 40.Half of 138 =

Answer key

  1. 54
  2. 84
  3. 45
  4. 122
  5. 86
  6. 124
  7. 29
  8. 81
  9. 99
  10. 76
  11. 82
  12. 150
  13. 36
  14. 20
  15. 17
  16. 166
  17. 50
  18. 184
  19. 142
  20. 31
  21. 18
  22. 62
  23. 68
  24. 94
  25. 66
  26. 52
  27. 82
  28. 192
  29. 80
  30. 132
  31. 96
  32. 84
  33. 156
  34. 58
  35. 24
  36. 40
  37. 49
  38. 154
  39. 23
  40. 69

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