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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 395 · 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 84 =
  2. 2.Double 68 =
  3. 3.Half of 168 =
  4. 4.Half of 132 =
  5. 5.Double 77 =
  6. 6.Half of 34 =
  7. 7.Double 37 =
  8. 8.Half of 66 =
  9. 9.Double 54 =
  10. 10.Double 66 =
  11. 11.Double 89 =
  12. 12.Half of 198 =
  13. 13.Double 88 =
  14. 14.Double 84 =
  15. 15.Double 71 =
  16. 16.Double 51 =
  17. 17.Half of 80 =
  18. 18.Half of 138 =
  19. 19.Half of 88 =
  20. 20.Double 74 =
  21. 21.Double 23 =
  22. 22.Half of 54 =
  23. 23.Double 75 =
  24. 24.Double 34 =
  25. 25.Half of 36 =
  26. 26.Double 65 =
  27. 27.Double 41 =
  28. 28.Double 36 =
  29. 29.Double 61 =
  30. 30.Half of 56 =
  31. 31.Half of 188 =
  32. 32.Double 62 =
  33. 33.Half of 90 =
  34. 34.Half of 30 =
  35. 35.Half of 26 =
  36. 36.Half of 52 =
  37. 37.Half of 134 =
  38. 38.Half of 82 =
  39. 39.Double 92 =
  40. 40.Double 86 =

Answer key

  1. 42
  2. 136
  3. 84
  4. 66
  5. 154
  6. 17
  7. 74
  8. 33
  9. 108
  10. 132
  11. 178
  12. 99
  13. 176
  14. 168
  15. 142
  16. 102
  17. 40
  18. 69
  19. 44
  20. 148
  21. 46
  22. 27
  23. 150
  24. 68
  25. 18
  26. 130
  27. 82
  28. 72
  29. 122
  30. 28
  31. 94
  32. 124
  33. 45
  34. 15
  35. 13
  36. 26
  37. 67
  38. 41
  39. 184
  40. 172

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