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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 2 · 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 80 =
  2. 2.Half of 46 =
  3. 3.Double 81 =
  4. 4.Half of 100 =
  5. 5.Half of 124 =
  6. 6.Double 36 =
  7. 7.Double 26 =
  8. 8.Double 83 =
  9. 9.Double 18 =
  10. 10.Double 54 =
  11. 11.Double 61 =
  12. 12.Double 34 =
  13. 13.Half of 138 =
  14. 14.Double 21 =
  15. 15.Half of 72 =
  16. 16.Half of 78 =
  17. 17.Double 51 =
  18. 18.Double 56 =
  19. 19.Double 52 =
  20. 20.Half of 172 =
  21. 21.Double 49 =
  22. 22.Half of 112 =
  23. 23.Double 17 =
  24. 24.Double 95 =
  25. 25.Double 46 =
  26. 26.Half of 136 =
  27. 27.Double 84 =
  28. 28.Half of 192 =
  29. 29.Half of 62 =
  30. 30.Half of 104 =
  31. 31.Double 37 =
  32. 32.Double 35 =
  33. 33.Double 31 =
  34. 34.Half of 86 =
  35. 35.Double 77 =
  36. 36.Half of 74 =
  37. 37.Double 22 =
  38. 38.Double 67 =
  39. 39.Half of 66 =
  40. 40.Half of 174 =

Answer key

  1. 40
  2. 23
  3. 162
  4. 50
  5. 62
  6. 72
  7. 52
  8. 166
  9. 36
  10. 108
  11. 122
  12. 68
  13. 69
  14. 42
  15. 36
  16. 39
  17. 102
  18. 112
  19. 104
  20. 86
  21. 98
  22. 56
  23. 34
  24. 190
  25. 92
  26. 68
  27. 168
  28. 96
  29. 31
  30. 52
  31. 74
  32. 70
  33. 62
  34. 43
  35. 154
  36. 37
  37. 44
  38. 134
  39. 33
  40. 87

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