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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 46 · 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 32 =
  2. 2.Double 97 =
  3. 3.Double 28 =
  4. 4.Double 96 =
  5. 5.Half of 110 =
  6. 6.Half of 188 =
  7. 7.Half of 56 =
  8. 8.Double 68 =
  9. 9.Double 89 =
  10. 10.Half of 54 =
  11. 11.Half of 182 =
  12. 12.Half of 180 =
  13. 13.Double 36 =
  14. 14.Double 25 =
  15. 15.Half of 194 =
  16. 16.Double 84 =
  17. 17.Half of 32 =
  18. 18.Double 34 =
  19. 19.Half of 38 =
  20. 20.Double 61 =
  21. 21.Half of 114 =
  22. 22.Double 41 =
  23. 23.Half of 96 =
  24. 24.Half of 164 =
  25. 25.Half of 106 =
  26. 26.Half of 66 =
  27. 27.Double 35 =
  28. 28.Half of 162 =
  29. 29.Half of 70 =
  30. 30.Half of 72 =
  31. 31.Double 31 =
  32. 32.Double 66 =
  33. 33.Double 83 =
  34. 34.Half of 64 =
  35. 35.Half of 126 =
  36. 36.Double 81 =
  37. 37.Half of 130 =
  38. 38.Double 72 =
  39. 39.Half of 40 =
  40. 40.Half of 102 =

Answer key

  1. 64
  2. 194
  3. 56
  4. 192
  5. 55
  6. 94
  7. 28
  8. 136
  9. 178
  10. 27
  11. 91
  12. 90
  13. 72
  14. 50
  15. 97
  16. 168
  17. 16
  18. 68
  19. 19
  20. 122
  21. 57
  22. 82
  23. 48
  24. 82
  25. 53
  26. 33
  27. 70
  28. 81
  29. 35
  30. 36
  31. 62
  32. 132
  33. 166
  34. 32
  35. 63
  36. 162
  37. 65
  38. 144
  39. 20
  40. 51

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