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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 514 · 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.Double 97 =
  3. 3.Half of 188 =
  4. 4.Double 71 =
  5. 5.Half of 98 =
  6. 6.Half of 132 =
  7. 7.Double 21 =
  8. 8.Half of 194 =
  9. 9.Double 66 =
  10. 10.Double 33 =
  11. 11.Half of 174 =
  12. 12.Half of 138 =
  13. 13.Half of 134 =
  14. 14.Half of 176 =
  15. 15.Half of 96 =
  16. 16.Double 31 =
  17. 17.Double 83 =
  18. 18.Double 89 =
  19. 19.Half of 156 =
  20. 20.Half of 78 =
  21. 21.Double 37 =
  22. 22.Double 88 =
  23. 23.Double 24 =
  24. 24.Half of 184 =
  25. 25.Half of 164 =
  26. 26.Double 74 =
  27. 27.Double 41 =
  28. 28.Half of 158 =
  29. 29.Half of 82 =
  30. 30.Half of 140 =
  31. 31.Half of 106 =
  32. 32.Double 39 =
  33. 33.Double 96 =
  34. 34.Double 59 =
  35. 35.Half of 142 =
  36. 36.Half of 110 =
  37. 37.Half of 58 =
  38. 38.Double 32 =
  39. 39.Double 93 =
  40. 40.Half of 74 =

Answer key

  1. 72
  2. 194
  3. 94
  4. 142
  5. 49
  6. 66
  7. 42
  8. 97
  9. 132
  10. 66
  11. 87
  12. 69
  13. 67
  14. 88
  15. 48
  16. 62
  17. 166
  18. 178
  19. 78
  20. 39
  21. 74
  22. 176
  23. 48
  24. 92
  25. 82
  26. 148
  27. 82
  28. 79
  29. 41
  30. 70
  31. 53
  32. 78
  33. 192
  34. 118
  35. 71
  36. 55
  37. 29
  38. 64
  39. 186
  40. 37

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