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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 385 · 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 108 =
  2. 2.Half of 42 =
  3. 3.Double 91 =
  4. 4.Double 98 =
  5. 5.Double 56 =
  6. 6.Double 55 =
  7. 7.Half of 74 =
  8. 8.Half of 68 =
  9. 9.Half of 116 =
  10. 10.Half of 110 =
  11. 11.Half of 162 =
  12. 12.Double 51 =
  13. 13.Double 48 =
  14. 14.Double 41 =
  15. 15.Half of 90 =
  16. 16.Double 81 =
  17. 17.Double 68 =
  18. 18.Double 89 =
  19. 19.Double 87 =
  20. 20.Double 23 =
  21. 21.Double 75 =
  22. 22.Double 66 =
  23. 23.Half of 124 =
  24. 24.Half of 170 =
  25. 25.Double 61 =
  26. 26.Half of 122 =
  27. 27.Double 38 =
  28. 28.Half of 98 =
  29. 29.Half of 96 =
  30. 30.Half of 164 =
  31. 31.Half of 184 =
  32. 32.Double 82 =
  33. 33.Double 77 =
  34. 34.Double 65 =
  35. 35.Half of 190 =
  36. 36.Double 95 =
  37. 37.Double 64 =
  38. 38.Double 94 =
  39. 39.Half of 62 =
  40. 40.Half of 120 =

Answer key

  1. 54
  2. 21
  3. 182
  4. 196
  5. 112
  6. 110
  7. 37
  8. 34
  9. 58
  10. 55
  11. 81
  12. 102
  13. 96
  14. 82
  15. 45
  16. 162
  17. 136
  18. 178
  19. 174
  20. 46
  21. 150
  22. 132
  23. 62
  24. 85
  25. 122
  26. 61
  27. 76
  28. 49
  29. 48
  30. 82
  31. 92
  32. 164
  33. 154
  34. 130
  35. 95
  36. 190
  37. 128
  38. 188
  39. 31
  40. 60

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