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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 519 · 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 36 =
  2. 2.Half of 128 =
  3. 3.Double 71 =
  4. 4.Half of 120 =
  5. 5.Double 33 =
  6. 6.Double 58 =
  7. 7.Half of 52 =
  8. 8.Half of 168 =
  9. 9.Double 41 =
  10. 10.Half of 176 =
  11. 11.Half of 146 =
  12. 12.Double 84 =
  13. 13.Half of 134 =
  14. 14.Double 51 =
  15. 15.Half of 56 =
  16. 16.Half of 36 =
  17. 17.Half of 26 =
  18. 18.Double 69 =
  19. 19.Double 39 =
  20. 20.Double 97 =
  21. 21.Double 75 =
  22. 22.Double 26 =
  23. 23.Half of 180 =
  24. 24.Double 81 =
  25. 25.Double 31 =
  26. 26.Half of 112 =
  27. 27.Double 38 =
  28. 28.Half of 66 =
  29. 29.Double 61 =
  30. 30.Half of 152 =
  31. 31.Half of 160 =
  32. 32.Half of 54 =
  33. 33.Double 82 =
  34. 34.Double 16 =
  35. 35.Double 91 =
  36. 36.Double 55 =
  37. 37.Double 18 =
  38. 38.Half of 186 =
  39. 39.Half of 100 =
  40. 40.Double 96 =

Answer key

  1. 72
  2. 64
  3. 142
  4. 60
  5. 66
  6. 116
  7. 26
  8. 84
  9. 82
  10. 88
  11. 73
  12. 168
  13. 67
  14. 102
  15. 28
  16. 18
  17. 13
  18. 138
  19. 78
  20. 194
  21. 150
  22. 52
  23. 90
  24. 162
  25. 62
  26. 56
  27. 76
  28. 33
  29. 122
  30. 76
  31. 80
  32. 27
  33. 164
  34. 32
  35. 182
  36. 110
  37. 36
  38. 93
  39. 50
  40. 192

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