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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 189 · 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 41 =
  2. 2.Half of 28 =
  3. 3.Half of 160 =
  4. 4.Half of 174 =
  5. 5.Half of 38 =
  6. 6.Half of 62 =
  7. 7.Double 84 =
  8. 8.Double 96 =
  9. 9.Half of 128 =
  10. 10.Double 27 =
  11. 11.Half of 44 =
  12. 12.Double 24 =
  13. 13.Half of 130 =
  14. 14.Half of 60 =
  15. 15.Double 44 =
  16. 16.Half of 54 =
  17. 17.Half of 114 =
  18. 18.Half of 106 =
  19. 19.Double 37 =
  20. 20.Double 52 =
  21. 21.Double 26 =
  22. 22.Half of 96 =
  23. 23.Half of 86 =
  24. 24.Double 17 =
  25. 25.Double 48 =
  26. 26.Half of 48 =
  27. 27.Double 21 =
  28. 28.Half of 180 =
  29. 29.Double 56 =
  30. 30.Half of 168 =
  31. 31.Double 58 =
  32. 32.Double 83 =
  33. 33.Double 76 =
  34. 34.Half of 90 =
  35. 35.Half of 82 =
  36. 36.Double 73 =
  37. 37.Half of 58 =
  38. 38.Half of 88 =
  39. 39.Double 16 =
  40. 40.Double 64 =

Answer key

  1. 82
  2. 14
  3. 80
  4. 87
  5. 19
  6. 31
  7. 168
  8. 192
  9. 64
  10. 54
  11. 22
  12. 48
  13. 65
  14. 30
  15. 88
  16. 27
  17. 57
  18. 53
  19. 74
  20. 104
  21. 52
  22. 48
  23. 43
  24. 34
  25. 96
  26. 24
  27. 42
  28. 90
  29. 112
  30. 84
  31. 116
  32. 166
  33. 152
  34. 45
  35. 41
  36. 146
  37. 29
  38. 44
  39. 32
  40. 128

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