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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 750 · 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 68 =
  2. 2.Double 62 =
  3. 3.Half of 180 =
  4. 4.Half of 184 =
  5. 5.Half of 176 =
  6. 6.Double 45 =
  7. 7.Double 79 =
  8. 8.Double 93 =
  9. 9.Double 69 =
  10. 10.Half of 142 =
  11. 11.Double 51 =
  12. 12.Half of 194 =
  13. 13.Half of 82 =
  14. 14.Half of 158 =
  15. 15.Half of 132 =
  16. 16.Half of 32 =
  17. 17.Double 31 =
  18. 18.Double 52 =
  19. 19.Double 34 =
  20. 20.Double 39 =
  21. 21.Half of 116 =
  22. 22.Half of 30 =
  23. 23.Half of 42 =
  24. 24.Double 86 =
  25. 25.Half of 130 =
  26. 26.Double 94 =
  27. 27.Double 82 =
  28. 28.Double 41 =
  29. 29.Half of 198 =
  30. 30.Half of 164 =
  31. 31.Double 68 =
  32. 32.Half of 108 =
  33. 33.Half of 28 =
  34. 34.Half of 118 =
  35. 35.Double 97 =
  36. 36.Half of 104 =
  37. 37.Double 35 =
  38. 38.Double 57 =
  39. 39.Half of 36 =
  40. 40.Half of 96 =

Answer key

  1. 34
  2. 124
  3. 90
  4. 92
  5. 88
  6. 90
  7. 158
  8. 186
  9. 138
  10. 71
  11. 102
  12. 97
  13. 41
  14. 79
  15. 66
  16. 16
  17. 62
  18. 104
  19. 68
  20. 78
  21. 58
  22. 15
  23. 21
  24. 172
  25. 65
  26. 188
  27. 164
  28. 82
  29. 99
  30. 82
  31. 136
  32. 54
  33. 14
  34. 59
  35. 194
  36. 52
  37. 70
  38. 114
  39. 18
  40. 48

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