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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 80 · 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 58 =
  2. 2.Double 57 =
  3. 3.Double 31 =
  4. 4.Half of 36 =
  5. 5.Half of 166 =
  6. 6.Double 68 =
  7. 7.Half of 30 =
  8. 8.Double 79 =
  9. 9.Half of 160 =
  10. 10.Half of 74 =
  11. 11.Double 27 =
  12. 12.Half of 28 =
  13. 13.Half of 138 =
  14. 14.Double 73 =
  15. 15.Double 63 =
  16. 16.Half of 144 =
  17. 17.Double 29 =
  18. 18.Double 52 =
  19. 19.Half of 180 =
  20. 20.Half of 40 =
  21. 21.Double 36 =
  22. 22.Half of 68 =
  23. 23.Half of 150 =
  24. 24.Half of 186 =
  25. 25.Double 98 =
  26. 26.Half of 48 =
  27. 27.Half of 132 =
  28. 28.Double 64 =
  29. 29.Double 45 =
  30. 30.Double 51 =
  31. 31.Double 65 =
  32. 32.Double 84 =
  33. 33.Double 41 =
  34. 34.Double 86 =
  35. 35.Double 54 =
  36. 36.Half of 188 =
  37. 37.Double 25 =
  38. 38.Half of 110 =
  39. 39.Half of 84 =
  40. 40.Half of 152 =

Answer key

  1. 29
  2. 114
  3. 62
  4. 18
  5. 83
  6. 136
  7. 15
  8. 158
  9. 80
  10. 37
  11. 54
  12. 14
  13. 69
  14. 146
  15. 126
  16. 72
  17. 58
  18. 104
  19. 90
  20. 20
  21. 72
  22. 34
  23. 75
  24. 93
  25. 196
  26. 24
  27. 66
  28. 128
  29. 90
  30. 102
  31. 130
  32. 168
  33. 82
  34. 172
  35. 108
  36. 94
  37. 50
  38. 55
  39. 42
  40. 76

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