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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 461 · 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 23 =
  2. 2.Double 76 =
  3. 3.Double 54 =
  4. 4.Double 83 =
  5. 5.Double 82 =
  6. 6.Half of 146 =
  7. 7.Half of 156 =
  8. 8.Half of 34 =
  9. 9.Half of 64 =
  10. 10.Half of 174 =
  11. 11.Half of 28 =
  12. 12.Double 31 =
  13. 13.Double 57 =
  14. 14.Double 49 =
  15. 15.Half of 100 =
  16. 16.Double 79 =
  17. 17.Double 95 =
  18. 18.Double 25 =
  19. 19.Double 88 =
  20. 20.Half of 54 =
  21. 21.Half of 188 =
  22. 22.Half of 144 =
  23. 23.Double 33 =
  24. 24.Double 41 =
  25. 25.Double 96 =
  26. 26.Double 21 =
  27. 27.Half of 124 =
  28. 28.Half of 68 =
  29. 29.Double 44 =
  30. 30.Double 51 =
  31. 31.Double 85 =
  32. 32.Double 86 =
  33. 33.Half of 52 =
  34. 34.Half of 66 =
  35. 35.Half of 40 =
  36. 36.Half of 176 =
  37. 37.Half of 62 =
  38. 38.Double 92 =
  39. 39.Half of 106 =
  40. 40.Half of 180 =

Answer key

  1. 46
  2. 152
  3. 108
  4. 166
  5. 164
  6. 73
  7. 78
  8. 17
  9. 32
  10. 87
  11. 14
  12. 62
  13. 114
  14. 98
  15. 50
  16. 158
  17. 190
  18. 50
  19. 176
  20. 27
  21. 94
  22. 72
  23. 66
  24. 82
  25. 192
  26. 42
  27. 62
  28. 34
  29. 88
  30. 102
  31. 170
  32. 172
  33. 26
  34. 33
  35. 20
  36. 88
  37. 31
  38. 184
  39. 53
  40. 90

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