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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 104 · 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 76 =
  2. 2.Double 18 =
  3. 3.Half of 74 =
  4. 4.Double 21 =
  5. 5.Double 95 =
  6. 6.Double 69 =
  7. 7.Half of 198 =
  8. 8.Double 35 =
  9. 9.Double 48 =
  10. 10.Double 31 =
  11. 11.Double 97 =
  12. 12.Half of 166 =
  13. 13.Half of 84 =
  14. 14.Half of 196 =
  15. 15.Double 89 =
  16. 16.Half of 92 =
  17. 17.Half of 146 =
  18. 18.Half of 180 =
  19. 19.Half of 72 =
  20. 20.Double 41 =
  21. 21.Double 64 =
  22. 22.Double 54 =
  23. 23.Half of 118 =
  24. 24.Half of 140 =
  25. 25.Half of 52 =
  26. 26.Half of 68 =
  27. 27.Half of 134 =
  28. 28.Half of 136 =
  29. 29.Double 49 =
  30. 30.Double 39 =
  31. 31.Double 81 =
  32. 32.Half of 108 =
  33. 33.Half of 168 =
  34. 34.Half of 40 =
  35. 35.Half of 70 =
  36. 36.Double 32 =
  37. 37.Half of 186 =
  38. 38.Half of 174 =
  39. 39.Half of 36 =
  40. 40.Half of 38 =

Answer key

  1. 38
  2. 36
  3. 37
  4. 42
  5. 190
  6. 138
  7. 99
  8. 70
  9. 96
  10. 62
  11. 194
  12. 83
  13. 42
  14. 98
  15. 178
  16. 46
  17. 73
  18. 90
  19. 36
  20. 82
  21. 128
  22. 108
  23. 59
  24. 70
  25. 26
  26. 34
  27. 67
  28. 68
  29. 98
  30. 78
  31. 162
  32. 54
  33. 84
  34. 20
  35. 35
  36. 64
  37. 93
  38. 87
  39. 18
  40. 19

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