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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 781 · 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 32 =
  2. 2.Half of 52 =
  3. 3.Double 51 =
  4. 4.Half of 124 =
  5. 5.Double 27 =
  6. 6.Double 41 =
  7. 7.Half of 64 =
  8. 8.Half of 90 =
  9. 9.Double 95 =
  10. 10.Double 17 =
  11. 11.Double 47 =
  12. 12.Half of 184 =
  13. 13.Half of 76 =
  14. 14.Half of 118 =
  15. 15.Double 83 =
  16. 16.Half of 70 =
  17. 17.Half of 44 =
  18. 18.Half of 186 =
  19. 19.Double 46 =
  20. 20.Half of 78 =
  21. 21.Half of 62 =
  22. 22.Half of 108 =
  23. 23.Double 94 =
  24. 24.Double 65 =
  25. 25.Double 69 =
  26. 26.Half of 146 =
  27. 27.Half of 120 =
  28. 28.Half of 180 =
  29. 29.Half of 194 =
  30. 30.Double 22 =
  31. 31.Half of 154 =
  32. 32.Half of 132 =
  33. 33.Double 89 =
  34. 34.Double 85 =
  35. 35.Half of 58 =
  36. 36.Double 29 =
  37. 37.Half of 158 =
  38. 38.Half of 92 =
  39. 39.Half of 46 =
  40. 40.Double 31 =

Answer key

  1. 16
  2. 26
  3. 102
  4. 62
  5. 54
  6. 82
  7. 32
  8. 45
  9. 190
  10. 34
  11. 94
  12. 92
  13. 38
  14. 59
  15. 166
  16. 35
  17. 22
  18. 93
  19. 92
  20. 39
  21. 31
  22. 54
  23. 188
  24. 130
  25. 138
  26. 73
  27. 60
  28. 90
  29. 97
  30. 44
  31. 77
  32. 66
  33. 178
  34. 170
  35. 29
  36. 58
  37. 79
  38. 46
  39. 23
  40. 62

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