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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 403 · 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 198 =
  2. 2.Half of 38 =
  3. 3.Half of 40 =
  4. 4.Half of 124 =
  5. 5.Double 71 =
  6. 6.Half of 170 =
  7. 7.Half of 172 =
  8. 8.Double 56 =
  9. 9.Half of 130 =
  10. 10.Double 31 =
  11. 11.Double 19 =
  12. 12.Half of 118 =
  13. 13.Double 83 =
  14. 14.Half of 182 =
  15. 15.Half of 80 =
  16. 16.Double 26 =
  17. 17.Half of 138 =
  18. 18.Half of 78 =
  19. 19.Half of 36 =
  20. 20.Half of 190 =
  21. 21.Half of 88 =
  22. 22.Double 21 =
  23. 23.Half of 76 =
  24. 24.Half of 66 =
  25. 25.Half of 156 =
  26. 26.Half of 90 =
  27. 27.Half of 188 =
  28. 28.Double 94 =
  29. 29.Double 35 =
  30. 30.Double 78 =
  31. 31.Half of 26 =
  32. 32.Half of 166 =
  33. 33.Double 51 =
  34. 34.Double 36 =
  35. 35.Double 55 =
  36. 36.Double 61 =
  37. 37.Half of 160 =
  38. 38.Double 47 =
  39. 39.Half of 136 =
  40. 40.Double 91 =

Answer key

  1. 99
  2. 19
  3. 20
  4. 62
  5. 142
  6. 85
  7. 86
  8. 112
  9. 65
  10. 62
  11. 38
  12. 59
  13. 166
  14. 91
  15. 40
  16. 52
  17. 69
  18. 39
  19. 18
  20. 95
  21. 44
  22. 42
  23. 38
  24. 33
  25. 78
  26. 45
  27. 94
  28. 188
  29. 70
  30. 156
  31. 13
  32. 83
  33. 102
  34. 72
  35. 110
  36. 122
  37. 80
  38. 94
  39. 68
  40. 182

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