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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 804 · 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 85 =
  2. 2.Half of 42 =
  3. 3.Double 51 =
  4. 4.Half of 120 =
  5. 5.Double 67 =
  6. 6.Half of 192 =
  7. 7.Half of 118 =
  8. 8.Double 38 =
  9. 9.Double 98 =
  10. 10.Double 95 =
  11. 11.Double 42 =
  12. 12.Half of 100 =
  13. 13.Double 71 =
  14. 14.Half of 182 =
  15. 15.Half of 168 =
  16. 16.Half of 84 =
  17. 17.Double 72 =
  18. 18.Double 81 =
  19. 19.Double 89 =
  20. 20.Half of 74 =
  21. 21.Half of 196 =
  22. 22.Double 57 =
  23. 23.Half of 26 =
  24. 24.Half of 38 =
  25. 25.Half of 158 =
  26. 26.Half of 34 =
  27. 27.Double 31 =
  28. 28.Double 87 =
  29. 29.Double 18 =
  30. 30.Half of 52 =
  31. 31.Half of 122 =
  32. 32.Double 58 =
  33. 33.Half of 30 =
  34. 34.Half of 56 =
  35. 35.Double 45 =
  36. 36.Double 92 =
  37. 37.Half of 66 =
  38. 38.Double 52 =
  39. 39.Half of 68 =
  40. 40.Half of 48 =

Answer key

  1. 170
  2. 21
  3. 102
  4. 60
  5. 134
  6. 96
  7. 59
  8. 76
  9. 196
  10. 190
  11. 84
  12. 50
  13. 142
  14. 91
  15. 84
  16. 42
  17. 144
  18. 162
  19. 178
  20. 37
  21. 98
  22. 114
  23. 13
  24. 19
  25. 79
  26. 17
  27. 62
  28. 174
  29. 36
  30. 26
  31. 61
  32. 116
  33. 15
  34. 28
  35. 90
  36. 184
  37. 33
  38. 104
  39. 34
  40. 24

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