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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 159 · 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.Double 45 =
  3. 3.Double 65 =
  4. 4.Double 84 =
  5. 5.Half of 78 =
  6. 6.Double 83 =
  7. 7.Half of 34 =
  8. 8.Half of 40 =
  9. 9.Double 37 =
  10. 10.Double 42 =
  11. 11.Double 36 =
  12. 12.Double 86 =
  13. 13.Half of 134 =
  14. 14.Double 17 =
  15. 15.Half of 124 =
  16. 16.Double 68 =
  17. 17.Half of 74 =
  18. 18.Half of 88 =
  19. 19.Half of 98 =
  20. 20.Double 94 =
  21. 21.Half of 68 =
  22. 22.Double 46 =
  23. 23.Double 79 =
  24. 24.Half of 150 =
  25. 25.Half of 114 =
  26. 26.Double 23 =
  27. 27.Double 47 =
  28. 28.Double 71 =
  29. 29.Half of 180 =
  30. 30.Half of 30 =
  31. 31.Half of 96 =
  32. 32.Double 99 =
  33. 33.Half of 94 =
  34. 34.Double 61 =
  35. 35.Double 51 =
  36. 36.Half of 50 =
  37. 37.Half of 194 =
  38. 38.Half of 36 =
  39. 39.Half of 52 =
  40. 40.Half of 126 =

Answer key

  1. 65
  2. 90
  3. 130
  4. 168
  5. 39
  6. 166
  7. 17
  8. 20
  9. 74
  10. 84
  11. 72
  12. 172
  13. 67
  14. 34
  15. 62
  16. 136
  17. 37
  18. 44
  19. 49
  20. 188
  21. 34
  22. 92
  23. 158
  24. 75
  25. 57
  26. 46
  27. 94
  28. 142
  29. 90
  30. 15
  31. 48
  32. 198
  33. 47
  34. 122
  35. 102
  36. 25
  37. 97
  38. 18
  39. 26
  40. 63

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