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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 288 · 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 24 =
  2. 2.Double 17 =
  3. 3.Half of 36 =
  4. 4.Double 53 =
  5. 5.Half of 174 =
  6. 6.Double 82 =
  7. 7.Half of 146 =
  8. 8.Half of 42 =
  9. 9.Double 71 =
  10. 10.Double 87 =
  11. 11.Double 42 =
  12. 12.Double 35 =
  13. 13.Half of 60 =
  14. 14.Double 65 =
  15. 15.Half of 188 =
  16. 16.Half of 34 =
  17. 17.Half of 48 =
  18. 18.Half of 82 =
  19. 19.Half of 88 =
  20. 20.Half of 50 =
  21. 21.Double 94 =
  22. 22.Half of 162 =
  23. 23.Half of 74 =
  24. 24.Half of 122 =
  25. 25.Double 23 =
  26. 26.Half of 166 =
  27. 27.Double 81 =
  28. 28.Double 37 =
  29. 29.Half of 186 =
  30. 30.Half of 180 =
  31. 31.Double 51 =
  32. 32.Half of 102 =
  33. 33.Double 76 =
  34. 34.Half of 46 =
  35. 35.Half of 40 =
  36. 36.Double 27 =
  37. 37.Half of 120 =
  38. 38.Double 79 =
  39. 39.Half of 32 =
  40. 40.Double 18 =

Answer key

  1. 48
  2. 34
  3. 18
  4. 106
  5. 87
  6. 164
  7. 73
  8. 21
  9. 142
  10. 174
  11. 84
  12. 70
  13. 30
  14. 130
  15. 94
  16. 17
  17. 24
  18. 41
  19. 44
  20. 25
  21. 188
  22. 81
  23. 37
  24. 61
  25. 46
  26. 83
  27. 162
  28. 74
  29. 93
  30. 90
  31. 102
  32. 51
  33. 152
  34. 23
  35. 20
  36. 54
  37. 60
  38. 158
  39. 16
  40. 36

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