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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 380 · 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 64 =
  2. 2.Half of 132 =
  3. 3.Double 22 =
  4. 4.Half of 196 =
  5. 5.Half of 116 =
  6. 6.Double 68 =
  7. 7.Double 35 =
  8. 8.Half of 190 =
  9. 9.Double 33 =
  10. 10.Double 98 =
  11. 11.Double 81 =
  12. 12.Double 24 =
  13. 13.Double 23 =
  14. 14.Double 71 =
  15. 15.Double 43 =
  16. 16.Double 21 =
  17. 17.Half of 78 =
  18. 18.Double 37 =
  19. 19.Half of 166 =
  20. 20.Double 32 =
  21. 21.Double 25 =
  22. 22.Double 36 =
  23. 23.Half of 152 =
  24. 24.Half of 178 =
  25. 25.Half of 174 =
  26. 26.Half of 150 =
  27. 27.Double 61 =
  28. 28.Half of 68 =
  29. 29.Half of 134 =
  30. 30.Half of 84 =
  31. 31.Half of 38 =
  32. 32.Half of 26 =
  33. 33.Double 91 =
  34. 34.Half of 118 =
  35. 35.Double 82 =
  36. 36.Half of 48 =
  37. 37.Double 31 =
  38. 38.Half of 192 =
  39. 39.Double 41 =
  40. 40.Half of 180 =

Answer key

  1. 32
  2. 66
  3. 44
  4. 98
  5. 58
  6. 136
  7. 70
  8. 95
  9. 66
  10. 196
  11. 162
  12. 48
  13. 46
  14. 142
  15. 86
  16. 42
  17. 39
  18. 74
  19. 83
  20. 64
  21. 50
  22. 72
  23. 76
  24. 89
  25. 87
  26. 75
  27. 122
  28. 34
  29. 67
  30. 42
  31. 19
  32. 13
  33. 182
  34. 59
  35. 164
  36. 24
  37. 62
  38. 96
  39. 82
  40. 90

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