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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 326 · 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 130 =
  2. 2.Half of 38 =
  3. 3.Double 71 =
  4. 4.Double 52 =
  5. 5.Double 41 =
  6. 6.Double 43 =
  7. 7.Half of 192 =
  8. 8.Half of 100 =
  9. 9.Double 85 =
  10. 10.Double 61 =
  11. 11.Half of 156 =
  12. 12.Double 95 =
  13. 13.Double 21 =
  14. 14.Half of 134 =
  15. 15.Half of 28 =
  16. 16.Half of 34 =
  17. 17.Double 77 =
  18. 18.Double 19 =
  19. 19.Half of 60 =
  20. 20.Double 24 =
  21. 21.Half of 86 =
  22. 22.Half of 116 =
  23. 23.Double 36 =
  24. 24.Half of 62 =
  25. 25.Double 17 =
  26. 26.Half of 126 =
  27. 27.Half of 30 =
  28. 28.Half of 70 =
  29. 29.Double 46 =
  30. 30.Half of 32 =
  31. 31.Half of 160 =
  32. 32.Half of 164 =
  33. 33.Half of 48 =
  34. 34.Double 54 =
  35. 35.Half of 40 =
  36. 36.Half of 118 =
  37. 37.Double 53 =
  38. 38.Half of 170 =
  39. 39.Half of 120 =
  40. 40.Half of 124 =

Answer key

  1. 65
  2. 19
  3. 142
  4. 104
  5. 82
  6. 86
  7. 96
  8. 50
  9. 170
  10. 122
  11. 78
  12. 190
  13. 42
  14. 67
  15. 14
  16. 17
  17. 154
  18. 38
  19. 30
  20. 48
  21. 43
  22. 58
  23. 72
  24. 31
  25. 34
  26. 63
  27. 15
  28. 35
  29. 92
  30. 16
  31. 80
  32. 82
  33. 24
  34. 108
  35. 20
  36. 59
  37. 106
  38. 85
  39. 60
  40. 62

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