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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 429 · 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 80 =
  2. 2.Double 74 =
  3. 3.Double 51 =
  4. 4.Double 82 =
  5. 5.Half of 32 =
  6. 6.Double 41 =
  7. 7.Double 59 =
  8. 8.Double 83 =
  9. 9.Double 47 =
  10. 10.Double 27 =
  11. 11.Half of 68 =
  12. 12.Half of 128 =
  13. 13.Double 36 =
  14. 14.Half of 34 =
  15. 15.Double 68 =
  16. 16.Double 31 =
  17. 17.Half of 104 =
  18. 18.Double 79 =
  19. 19.Half of 54 =
  20. 20.Half of 130 =
  21. 21.Half of 174 =
  22. 22.Double 95 =
  23. 23.Half of 84 =
  24. 24.Double 57 =
  25. 25.Double 38 =
  26. 26.Double 25 =
  27. 27.Half of 148 =
  28. 28.Double 54 =
  29. 29.Half of 42 =
  30. 30.Double 34 =
  31. 31.Half of 26 =
  32. 32.Double 84 =
  33. 33.Half of 94 =
  34. 34.Double 19 =
  35. 35.Half of 198 =
  36. 36.Half of 102 =
  37. 37.Half of 142 =
  38. 38.Half of 158 =
  39. 39.Half of 106 =
  40. 40.Double 75 =

Answer key

  1. 40
  2. 148
  3. 102
  4. 164
  5. 16
  6. 82
  7. 118
  8. 166
  9. 94
  10. 54
  11. 34
  12. 64
  13. 72
  14. 17
  15. 136
  16. 62
  17. 52
  18. 158
  19. 27
  20. 65
  21. 87
  22. 190
  23. 42
  24. 114
  25. 76
  26. 50
  27. 74
  28. 108
  29. 21
  30. 68
  31. 13
  32. 168
  33. 47
  34. 38
  35. 99
  36. 51
  37. 71
  38. 79
  39. 53
  40. 150

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