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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 562 · 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 98 =
  2. 2.Half of 142 =
  3. 3.Half of 36 =
  4. 4.Double 28 =
  5. 5.Double 94 =
  6. 6.Double 42 =
  7. 7.Half of 162 =
  8. 8.Double 23 =
  9. 9.Half of 94 =
  10. 10.Double 48 =
  11. 11.Double 55 =
  12. 12.Double 27 =
  13. 13.Half of 198 =
  14. 14.Half of 196 =
  15. 15.Half of 92 =
  16. 16.Half of 152 =
  17. 17.Double 31 =
  18. 18.Double 76 =
  19. 19.Half of 144 =
  20. 20.Double 33 =
  21. 21.Half of 68 =
  22. 22.Half of 168 =
  23. 23.Double 47 =
  24. 24.Half of 130 =
  25. 25.Half of 136 =
  26. 26.Double 85 =
  27. 27.Half of 170 =
  28. 28.Double 46 =
  29. 29.Double 83 =
  30. 30.Half of 40 =
  31. 31.Double 81 =
  32. 32.Half of 50 =
  33. 33.Half of 90 =
  34. 34.Half of 56 =
  35. 35.Half of 84 =
  36. 36.Half of 58 =
  37. 37.Double 77 =
  38. 38.Half of 116 =
  39. 39.Half of 192 =
  40. 40.Double 62 =

Answer key

  1. 49
  2. 71
  3. 18
  4. 56
  5. 188
  6. 84
  7. 81
  8. 46
  9. 47
  10. 96
  11. 110
  12. 54
  13. 99
  14. 98
  15. 46
  16. 76
  17. 62
  18. 152
  19. 72
  20. 66
  21. 34
  22. 84
  23. 94
  24. 65
  25. 68
  26. 170
  27. 85
  28. 92
  29. 166
  30. 20
  31. 162
  32. 25
  33. 45
  34. 28
  35. 42
  36. 29
  37. 154
  38. 58
  39. 96
  40. 124

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