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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 358 · 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 84 =
  2. 2.Double 35 =
  3. 3.Double 52 =
  4. 4.Double 82 =
  5. 5.Double 61 =
  6. 6.Half of 40 =
  7. 7.Half of 34 =
  8. 8.Half of 88 =
  9. 9.Half of 120 =
  10. 10.Half of 172 =
  11. 11.Double 18 =
  12. 12.Double 71 =
  13. 13.Half of 110 =
  14. 14.Double 32 =
  15. 15.Half of 152 =
  16. 16.Double 91 =
  17. 17.Half of 138 =
  18. 18.Double 24 =
  19. 19.Double 51 =
  20. 20.Half of 38 =
  21. 21.Half of 144 =
  22. 22.Double 27 =
  23. 23.Half of 190 =
  24. 24.Half of 180 =
  25. 25.Half of 156 =
  26. 26.Double 99 =
  27. 27.Double 95 =
  28. 28.Double 81 =
  29. 29.Half of 50 =
  30. 30.Double 46 =
  31. 31.Double 74 =
  32. 32.Half of 32 =
  33. 33.Double 64 =
  34. 34.Double 31 =
  35. 35.Half of 66 =
  36. 36.Half of 60 =
  37. 37.Half of 84 =
  38. 38.Half of 54 =
  39. 39.Half of 26 =
  40. 40.Half of 198 =

Answer key

  1. 168
  2. 70
  3. 104
  4. 164
  5. 122
  6. 20
  7. 17
  8. 44
  9. 60
  10. 86
  11. 36
  12. 142
  13. 55
  14. 64
  15. 76
  16. 182
  17. 69
  18. 48
  19. 102
  20. 19
  21. 72
  22. 54
  23. 95
  24. 90
  25. 78
  26. 198
  27. 190
  28. 162
  29. 25
  30. 92
  31. 148
  32. 16
  33. 128
  34. 62
  35. 33
  36. 30
  37. 42
  38. 27
  39. 13
  40. 99

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