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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 654 · 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 76 =
  2. 2.Double 64 =
  3. 3.Half of 134 =
  4. 4.Half of 186 =
  5. 5.Double 83 =
  6. 6.Half of 52 =
  7. 7.Double 94 =
  8. 8.Half of 160 =
  9. 9.Double 22 =
  10. 10.Half of 198 =
  11. 11.Half of 56 =
  12. 12.Half of 40 =
  13. 13.Double 82 =
  14. 14.Half of 142 =
  15. 15.Half of 38 =
  16. 16.Double 41 =
  17. 17.Half of 30 =
  18. 18.Double 57 =
  19. 19.Double 88 =
  20. 20.Half of 44 =
  21. 21.Double 21 =
  22. 22.Double 87 =
  23. 23.Double 76 =
  24. 24.Double 86 =
  25. 25.Double 49 =
  26. 26.Half of 50 =
  27. 27.Double 81 =
  28. 28.Half of 132 =
  29. 29.Double 39 =
  30. 30.Half of 28 =
  31. 31.Half of 70 =
  32. 32.Double 61 =
  33. 33.Half of 154 =
  34. 34.Double 31 =
  35. 35.Half of 42 =
  36. 36.Half of 148 =
  37. 37.Double 38 =
  38. 38.Half of 150 =
  39. 39.Double 67 =
  40. 40.Half of 98 =

Answer key

  1. 38
  2. 128
  3. 67
  4. 93
  5. 166
  6. 26
  7. 188
  8. 80
  9. 44
  10. 99
  11. 28
  12. 20
  13. 164
  14. 71
  15. 19
  16. 82
  17. 15
  18. 114
  19. 176
  20. 22
  21. 42
  22. 174
  23. 152
  24. 172
  25. 98
  26. 25
  27. 162
  28. 66
  29. 78
  30. 14
  31. 35
  32. 122
  33. 77
  34. 62
  35. 21
  36. 74
  37. 76
  38. 75
  39. 134
  40. 49

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