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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 350 · 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.Half of 116 =
  2. 2.Double 89 =
  3. 3.Double 27 =
  4. 4.Double 73 =
  5. 5.Half of 144 =
  6. 6.Half of 188 =
  7. 7.Double 71 =
  8. 8.Double 62 =
  9. 9.Half of 184 =
  10. 10.Double 85 =
  11. 11.Half of 196 =
  12. 12.Double 79 =
  13. 13.Half of 26 =
  14. 14.Double 45 =
  15. 15.Double 19 =
  16. 16.Double 66 =
  17. 17.Double 37 =
  18. 18.Half of 90 =
  19. 19.Half of 92 =
  20. 20.Half of 132 =
  21. 21.Half of 36 =
  22. 22.Double 49 =
  23. 23.Double 29 =
  24. 24.Half of 172 =
  25. 25.Double 54 =
  26. 26.Half of 108 =
  27. 27.Double 82 =
  28. 28.Double 83 =
  29. 29.Double 31 =
  30. 30.Half of 44 =
  31. 31.Double 55 =
  32. 32.Half of 80 =
  33. 33.Half of 52 =
  34. 34.Half of 72 =
  35. 35.Half of 166 =
  36. 36.Double 25 =
  37. 37.Half of 38 =
  38. 38.Half of 140 =
  39. 39.Half of 58 =
  40. 40.Double 52 =

Answer key

  1. 58
  2. 178
  3. 54
  4. 146
  5. 72
  6. 94
  7. 142
  8. 124
  9. 92
  10. 170
  11. 98
  12. 158
  13. 13
  14. 90
  15. 38
  16. 132
  17. 74
  18. 45
  19. 46
  20. 66
  21. 18
  22. 98
  23. 58
  24. 86
  25. 108
  26. 54
  27. 164
  28. 166
  29. 62
  30. 22
  31. 110
  32. 40
  33. 26
  34. 36
  35. 83
  36. 50
  37. 19
  38. 70
  39. 29
  40. 104

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