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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 374 · 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 71 =
  2. 2.Double 29 =
  3. 3.Half of 40 =
  4. 4.Double 25 =
  5. 5.Double 81 =
  6. 6.Half of 64 =
  7. 7.Double 43 =
  8. 8.Half of 174 =
  9. 9.Half of 98 =
  10. 10.Half of 196 =
  11. 11.Half of 176 =
  12. 12.Half of 136 =
  13. 13.Double 39 =
  14. 14.Double 35 =
  15. 15.Double 49 =
  16. 16.Double 51 =
  17. 17.Half of 70 =
  18. 18.Double 67 =
  19. 19.Half of 82 =
  20. 20.Half of 122 =
  21. 21.Half of 180 =
  22. 22.Half of 76 =
  23. 23.Double 23 =
  24. 24.Double 89 =
  25. 25.Double 97 =
  26. 26.Double 83 =
  27. 27.Double 22 =
  28. 28.Half of 140 =
  29. 29.Half of 62 =
  30. 30.Double 41 =
  31. 31.Double 19 =
  32. 32.Double 65 =
  33. 33.Double 27 =
  34. 34.Half of 104 =
  35. 35.Half of 28 =
  36. 36.Double 69 =
  37. 37.Half of 138 =
  38. 38.Double 53 =
  39. 39.Half of 168 =
  40. 40.Double 37 =

Answer key

  1. 142
  2. 58
  3. 20
  4. 50
  5. 162
  6. 32
  7. 86
  8. 87
  9. 49
  10. 98
  11. 88
  12. 68
  13. 78
  14. 70
  15. 98
  16. 102
  17. 35
  18. 134
  19. 41
  20. 61
  21. 90
  22. 38
  23. 46
  24. 178
  25. 194
  26. 166
  27. 44
  28. 70
  29. 31
  30. 82
  31. 38
  32. 130
  33. 54
  34. 52
  35. 14
  36. 138
  37. 69
  38. 106
  39. 84
  40. 74

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