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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 442 · 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 184 =
  2. 2.Double 86 =
  3. 3.Double 22 =
  4. 4.Half of 104 =
  5. 5.Half of 194 =
  6. 6.Half of 46 =
  7. 7.Double 23 =
  8. 8.Double 18 =
  9. 9.Half of 144 =
  10. 10.Half of 34 =
  11. 11.Double 35 =
  12. 12.Double 71 =
  13. 13.Half of 60 =
  14. 14.Double 84 =
  15. 15.Double 41 =
  16. 16.Double 28 =
  17. 17.Double 79 =
  18. 18.Double 32 =
  19. 19.Double 51 =
  20. 20.Half of 92 =
  21. 21.Double 82 =
  22. 22.Half of 146 =
  23. 23.Double 36 =
  24. 24.Double 81 =
  25. 25.Half of 68 =
  26. 26.Half of 90 =
  27. 27.Half of 150 =
  28. 28.Half of 168 =
  29. 29.Double 37 =
  30. 30.Half of 138 =
  31. 31.Half of 114 =
  32. 32.Half of 142 =
  33. 33.Double 26 =
  34. 34.Double 31 =
  35. 35.Half of 190 =
  36. 36.Double 62 =
  37. 37.Half of 50 =
  38. 38.Half of 74 =
  39. 39.Double 47 =
  40. 40.Double 72 =

Answer key

  1. 92
  2. 172
  3. 44
  4. 52
  5. 97
  6. 23
  7. 46
  8. 36
  9. 72
  10. 17
  11. 70
  12. 142
  13. 30
  14. 168
  15. 82
  16. 56
  17. 158
  18. 64
  19. 102
  20. 46
  21. 164
  22. 73
  23. 72
  24. 162
  25. 34
  26. 45
  27. 75
  28. 84
  29. 74
  30. 69
  31. 57
  32. 71
  33. 52
  34. 62
  35. 95
  36. 124
  37. 25
  38. 37
  39. 94
  40. 144

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