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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 405 · 40 questions
TalentJR

The fast method (Shift both): How much makes the second number round? 68 needs 2 to make 70. Add that amount to BOTH numbers. Take away the round number.

NameDateTime takenScore ___ / 40
  1. 1.537 − 18 =
  2. 2.172 − 77 =
  3. 3.536 − 36 =
  4. 4.139 − 68 =
  5. 5.390 − 88 =
  6. 6.89 − 57 =
  7. 7.162 − 89 =
  8. 8.131 − 16 =
  9. 9.219 − 49 =
  10. 10.599 − 28 =
  11. 11.166 − 87 =
  12. 12.515 − 27 =
  13. 13.518 − 68 =
  14. 14.253 − 57 =
  15. 15.507 − 59 =
  16. 16.576 − 59 =
  17. 17.152 − 49 =
  18. 18.84 − 79 =
  19. 19.580 − 18 =
  20. 20.534 − 26 =
  21. 21.592 − 26 =
  22. 22.504 − 96 =
  23. 23.583 − 66 =
  24. 24.194 − 26 =
  25. 25.526 − 98 =
  26. 26.596 − 36 =
  27. 27.203 − 38 =
  28. 28.409 − 59 =
  29. 29.246 − 26 =
  30. 30.173 − 56 =
  31. 31.137 − 59 =
  32. 32.219 − 68 =
  33. 33.96 − 17 =
  34. 34.239 − 87 =
  35. 35.400 − 29 =
  36. 36.152 − 67 =
  37. 37.144 − 69 =
  38. 38.130 − 87 =
  39. 39.363 − 47 =
  40. 40.107 − 36 =

Answer key

  1. 519
  2. 95
  3. 500
  4. 71
  5. 302
  6. 32
  7. 73
  8. 115
  9. 170
  10. 571
  11. 79
  12. 488
  13. 450
  14. 196
  15. 448
  16. 517
  17. 103
  18. 5
  19. 562
  20. 508
  21. 566
  22. 408
  23. 517
  24. 168
  25. 428
  26. 560
  27. 165
  28. 350
  29. 220
  30. 117
  31. 78
  32. 151
  33. 79
  34. 152
  35. 371
  36. 85
  37. 75
  38. 43
  39. 316
  40. 71

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