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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 114 · 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 190 =
  2. 2.Double 86 =
  3. 3.Double 59 =
  4. 4.Double 61 =
  5. 5.Half of 50 =
  6. 6.Double 76 =
  7. 7.Double 83 =
  8. 8.Half of 150 =
  9. 9.Double 92 =
  10. 10.Double 55 =
  11. 11.Double 51 =
  12. 12.Double 41 =
  13. 13.Half of 66 =
  14. 14.Double 31 =
  15. 15.Double 22 =
  16. 16.Half of 134 =
  17. 17.Half of 60 =
  18. 18.Double 21 =
  19. 19.Half of 78 =
  20. 20.Half of 82 =
  21. 21.Double 34 =
  22. 22.Double 24 =
  23. 23.Half of 80 =
  24. 24.Double 49 =
  25. 25.Half of 62 =
  26. 26.Half of 146 =
  27. 27.Half of 42 =
  28. 28.Double 36 =
  29. 29.Double 69 =
  30. 30.Half of 40 =
  31. 31.Double 52 =
  32. 32.Double 97 =
  33. 33.Half of 48 =
  34. 34.Half of 32 =
  35. 35.Double 43 =
  36. 36.Half of 106 =
  37. 37.Double 42 =
  38. 38.Double 87 =
  39. 39.Half of 92 =
  40. 40.Double 17 =

Answer key

  1. 95
  2. 172
  3. 118
  4. 122
  5. 25
  6. 152
  7. 166
  8. 75
  9. 184
  10. 110
  11. 102
  12. 82
  13. 33
  14. 62
  15. 44
  16. 67
  17. 30
  18. 42
  19. 39
  20. 41
  21. 68
  22. 48
  23. 40
  24. 98
  25. 31
  26. 73
  27. 21
  28. 72
  29. 138
  30. 20
  31. 104
  32. 194
  33. 24
  34. 16
  35. 86
  36. 53
  37. 84
  38. 174
  39. 46
  40. 34

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