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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 437 · 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 164 =
  2. 2.Half of 104 =
  3. 3.Half of 186 =
  4. 4.Double 87 =
  5. 5.Half of 180 =
  6. 6.Double 84 =
  7. 7.Half of 184 =
  8. 8.Double 28 =
  9. 9.Double 47 =
  10. 10.Double 24 =
  11. 11.Half of 108 =
  12. 12.Double 68 =
  13. 13.Double 62 =
  14. 14.Half of 38 =
  15. 15.Half of 192 =
  16. 16.Double 37 =
  17. 17.Double 95 =
  18. 18.Double 56 =
  19. 19.Double 89 =
  20. 20.Half of 120 =
  21. 21.Double 75 =
  22. 22.Double 71 =
  23. 23.Double 21 =
  24. 24.Double 63 =
  25. 25.Double 42 =
  26. 26.Double 33 =
  27. 27.Double 73 =
  28. 28.Double 85 =
  29. 29.Double 46 =
  30. 30.Half of 166 =
  31. 31.Double 26 =
  32. 32.Half of 148 =
  33. 33.Half of 30 =
  34. 34.Double 38 =
  35. 35.Double 77 =
  36. 36.Half of 188 =
  37. 37.Half of 62 =
  38. 38.Double 18 =
  39. 39.Double 79 =
  40. 40.Double 31 =

Answer key

  1. 82
  2. 52
  3. 93
  4. 174
  5. 90
  6. 168
  7. 92
  8. 56
  9. 94
  10. 48
  11. 54
  12. 136
  13. 124
  14. 19
  15. 96
  16. 74
  17. 190
  18. 112
  19. 178
  20. 60
  21. 150
  22. 142
  23. 42
  24. 126
  25. 84
  26. 66
  27. 146
  28. 170
  29. 92
  30. 83
  31. 52
  32. 74
  33. 15
  34. 76
  35. 154
  36. 94
  37. 31
  38. 36
  39. 158
  40. 62

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