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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 281 · 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 96 =
  2. 2.Double 72 =
  3. 3.Half of 84 =
  4. 4.Half of 26 =
  5. 5.Half of 52 =
  6. 6.Double 38 =
  7. 7.Half of 180 =
  8. 8.Double 84 =
  9. 9.Double 63 =
  10. 10.Double 45 =
  11. 11.Half of 30 =
  12. 12.Half of 194 =
  13. 13.Half of 40 =
  14. 14.Half of 144 =
  15. 15.Double 33 =
  16. 16.Half of 110 =
  17. 17.Half of 82 =
  18. 18.Half of 158 =
  19. 19.Half of 146 =
  20. 20.Half of 54 =
  21. 21.Half of 164 =
  22. 22.Double 76 =
  23. 23.Double 41 =
  24. 24.Half of 74 =
  25. 25.Double 86 =
  26. 26.Double 82 =
  27. 27.Half of 66 =
  28. 28.Double 19 =
  29. 29.Half of 50 =
  30. 30.Double 66 =
  31. 31.Half of 86 =
  32. 32.Double 79 =
  33. 33.Half of 166 =
  34. 34.Double 88 =
  35. 35.Double 31 =
  36. 36.Double 62 =
  37. 37.Half of 90 =
  38. 38.Half of 88 =
  39. 39.Half of 156 =
  40. 40.Double 42 =

Answer key

  1. 48
  2. 144
  3. 42
  4. 13
  5. 26
  6. 76
  7. 90
  8. 168
  9. 126
  10. 90
  11. 15
  12. 97
  13. 20
  14. 72
  15. 66
  16. 55
  17. 41
  18. 79
  19. 73
  20. 27
  21. 82
  22. 152
  23. 82
  24. 37
  25. 172
  26. 164
  27. 33
  28. 38
  29. 25
  30. 132
  31. 43
  32. 158
  33. 83
  34. 176
  35. 62
  36. 124
  37. 45
  38. 44
  39. 78
  40. 84

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