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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 101 · 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 98 =
  2. 2.Double 21 =
  3. 3.Half of 62 =
  4. 4.Double 89 =
  5. 5.Half of 42 =
  6. 6.Double 86 =
  7. 7.Double 35 =
  8. 8.Half of 54 =
  9. 9.Half of 26 =
  10. 10.Half of 80 =
  11. 11.Half of 70 =
  12. 12.Double 92 =
  13. 13.Half of 138 =
  14. 14.Half of 52 =
  15. 15.Double 53 =
  16. 16.Half of 132 =
  17. 17.Double 61 =
  18. 18.Double 19 =
  19. 19.Half of 142 =
  20. 20.Half of 108 =
  21. 21.Double 31 =
  22. 22.Double 94 =
  23. 23.Half of 146 =
  24. 24.Double 26 =
  25. 25.Double 75 =
  26. 26.Half of 186 =
  27. 27.Half of 160 =
  28. 28.Double 79 =
  29. 29.Double 41 =
  30. 30.Double 81 =
  31. 31.Half of 166 =
  32. 32.Half of 184 =
  33. 33.Double 46 =
  34. 34.Double 51 =
  35. 35.Half of 38 =
  36. 36.Double 95 =
  37. 37.Double 49 =
  38. 38.Half of 90 =
  39. 39.Double 54 =
  40. 40.Double 37 =

Answer key

  1. 196
  2. 42
  3. 31
  4. 178
  5. 21
  6. 172
  7. 70
  8. 27
  9. 13
  10. 40
  11. 35
  12. 184
  13. 69
  14. 26
  15. 106
  16. 66
  17. 122
  18. 38
  19. 71
  20. 54
  21. 62
  22. 188
  23. 73
  24. 52
  25. 150
  26. 93
  27. 80
  28. 158
  29. 82
  30. 162
  31. 83
  32. 92
  33. 92
  34. 102
  35. 19
  36. 190
  37. 98
  38. 45
  39. 108
  40. 74

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