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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 567 · 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 76 =
  2. 2.Double 71 =
  3. 3.Half of 116 =
  4. 4.Half of 140 =
  5. 5.Double 87 =
  6. 6.Double 51 =
  7. 7.Half of 70 =
  8. 8.Double 26 =
  9. 9.Half of 84 =
  10. 10.Double 41 =
  11. 11.Double 69 =
  12. 12.Double 67 =
  13. 13.Double 79 =
  14. 14.Half of 42 =
  15. 15.Half of 54 =
  16. 16.Double 78 =
  17. 17.Double 59 =
  18. 18.Double 22 =
  19. 19.Double 19 =
  20. 20.Half of 120 =
  21. 21.Half of 38 =
  22. 22.Double 21 =
  23. 23.Double 74 =
  24. 24.Double 64 =
  25. 25.Half of 82 =
  26. 26.Half of 188 =
  27. 27.Half of 164 =
  28. 28.Half of 96 =
  29. 29.Half of 40 =
  30. 30.Half of 198 =
  31. 31.Half of 68 =
  32. 32.Half of 196 =
  33. 33.Double 99 =
  34. 34.Double 93 =
  35. 35.Double 49 =
  36. 36.Half of 66 =
  37. 37.Double 18 =
  38. 38.Half of 74 =
  39. 39.Double 97 =
  40. 40.Double 55 =

Answer key

  1. 38
  2. 142
  3. 58
  4. 70
  5. 174
  6. 102
  7. 35
  8. 52
  9. 42
  10. 82
  11. 138
  12. 134
  13. 158
  14. 21
  15. 27
  16. 156
  17. 118
  18. 44
  19. 38
  20. 60
  21. 19
  22. 42
  23. 148
  24. 128
  25. 41
  26. 94
  27. 82
  28. 48
  29. 20
  30. 99
  31. 34
  32. 98
  33. 198
  34. 186
  35. 98
  36. 33
  37. 36
  38. 37
  39. 194
  40. 110

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