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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 588 · 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 138 =
  2. 2.Half of 50 =
  3. 3.Half of 130 =
  4. 4.Half of 160 =
  5. 5.Half of 180 =
  6. 6.Half of 44 =
  7. 7.Half of 42 =
  8. 8.Half of 158 =
  9. 9.Half of 172 =
  10. 10.Half of 168 =
  11. 11.Double 21 =
  12. 12.Half of 102 =
  13. 13.Half of 196 =
  14. 14.Double 41 =
  15. 15.Double 19 =
  16. 16.Double 55 =
  17. 17.Double 61 =
  18. 18.Half of 166 =
  19. 19.Double 18 =
  20. 20.Double 64 =
  21. 21.Half of 40 =
  22. 22.Double 73 =
  23. 23.Half of 106 =
  24. 24.Double 56 =
  25. 25.Double 39 =
  26. 26.Double 22 =
  27. 27.Double 86 =
  28. 28.Double 83 =
  29. 29.Double 32 =
  30. 30.Double 51 =
  31. 31.Half of 34 =
  32. 32.Double 26 =
  33. 33.Half of 156 =
  34. 34.Half of 28 =
  35. 35.Half of 126 =
  36. 36.Double 71 =
  37. 37.Double 81 =
  38. 38.Double 37 =
  39. 39.Half of 32 =
  40. 40.Double 31 =

Answer key

  1. 69
  2. 25
  3. 65
  4. 80
  5. 90
  6. 22
  7. 21
  8. 79
  9. 86
  10. 84
  11. 42
  12. 51
  13. 98
  14. 82
  15. 38
  16. 110
  17. 122
  18. 83
  19. 36
  20. 128
  21. 20
  22. 146
  23. 53
  24. 112
  25. 78
  26. 44
  27. 172
  28. 166
  29. 64
  30. 102
  31. 17
  32. 52
  33. 78
  34. 14
  35. 63
  36. 142
  37. 162
  38. 74
  39. 16
  40. 62

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