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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 668 · 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. 1.580 − 57 =
  2. 2.411 − 49 =
  3. 3.542 − 17 =
  4. 4.291 − 49 =
  5. 5.492 − 67 =
  6. 6.575 − 76 =
  7. 7.202 − 56 =
  8. 8.229 − 19 =
  9. 9.82 − 28 =
  10. 10.165 − 17 =
  11. 11.317 − 78 =
  12. 12.197 − 87 =
  13. 13.117 − 17 =
  14. 14.274 − 89 =
  15. 15.163 − 27 =
  16. 16.289 − 37 =
  17. 17.168 − 37 =
  18. 18.181 − 27 =
  19. 19.68 − 39 =
  20. 20.589 − 29 =
  21. 21.253 − 56 =
  22. 22.156 − 28 =
  23. 23.136 − 17 =
  24. 24.446 − 17 =
  25. 25.82 − 67 =
  26. 26.165 − 79 =
  27. 27.499 − 47 =
  28. 28.102 − 37 =
  29. 29.374 − 69 =
  30. 30.182 − 78 =
  31. 31.80 − 48 =
  32. 32.519 − 36 =
  33. 33.389 − 67 =
  34. 34.548 − 17 =
  35. 35.390 − 26 =
  36. 36.122 − 96 =
  37. 37.280 − 17 =
  38. 38.469 − 26 =
  39. 39.150 − 27 =
  40. 40.403 − 38 =

Answer key

  1. 523
  2. 362
  3. 525
  4. 242
  5. 425
  6. 499
  7. 146
  8. 210
  9. 54
  10. 148
  11. 239
  12. 110
  13. 100
  14. 185
  15. 136
  16. 252
  17. 131
  18. 154
  19. 29
  20. 560
  21. 197
  22. 128
  23. 119
  24. 429
  25. 15
  26. 86
  27. 452
  28. 65
  29. 305
  30. 104
  31. 32
  32. 483
  33. 322
  34. 531
  35. 364
  36. 26
  37. 263
  38. 443
  39. 123
  40. 365

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