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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 60 · 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 57 =
  2. 2.Double 61 =
  3. 3.Double 87 =
  4. 4.Double 88 =
  5. 5.Double 43 =
  6. 6.Half of 104 =
  7. 7.Half of 158 =
  8. 8.Half of 50 =
  9. 9.Half of 174 =
  10. 10.Half of 152 =
  11. 11.Half of 122 =
  12. 12.Half of 76 =
  13. 13.Double 41 =
  14. 14.Half of 58 =
  15. 15.Double 25 =
  16. 16.Half of 108 =
  17. 17.Half of 92 =
  18. 18.Double 21 =
  19. 19.Double 39 =
  20. 20.Double 54 =
  21. 21.Half of 180 =
  22. 22.Half of 56 =
  23. 23.Half of 166 =
  24. 24.Half of 82 =
  25. 25.Half of 66 =
  26. 26.Half of 46 =
  27. 27.Half of 170 =
  28. 28.Double 27 =
  29. 29.Double 94 =
  30. 30.Double 69 =
  31. 31.Half of 36 =
  32. 32.Half of 168 =
  33. 33.Half of 62 =
  34. 34.Double 71 =
  35. 35.Double 47 =
  36. 36.Double 91 =
  37. 37.Half of 84 =
  38. 38.Half of 172 =
  39. 39.Double 59 =
  40. 40.Half of 102 =

Answer key

  1. 114
  2. 122
  3. 174
  4. 176
  5. 86
  6. 52
  7. 79
  8. 25
  9. 87
  10. 76
  11. 61
  12. 38
  13. 82
  14. 29
  15. 50
  16. 54
  17. 46
  18. 42
  19. 78
  20. 108
  21. 90
  22. 28
  23. 83
  24. 41
  25. 33
  26. 23
  27. 85
  28. 54
  29. 188
  30. 138
  31. 18
  32. 84
  33. 31
  34. 142
  35. 94
  36. 182
  37. 42
  38. 86
  39. 118
  40. 51

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