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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 649 · 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. 1.450 − 16 =
  2. 2.336 − 46 =
  3. 3.338 − 77 =
  4. 4.326 − 37 =
  5. 5.123 − 78 =
  6. 6.556 − 97 =
  7. 7.173 − 49 =
  8. 8.531 − 27 =
  9. 9.488 − 68 =
  10. 10.325 − 68 =
  11. 11.135 − 37 =
  12. 12.494 − 16 =
  13. 13.53 − 17 =
  14. 14.595 − 37 =
  15. 15.84 − 76 =
  16. 16.52 − 39 =
  17. 17.198 − 48 =
  18. 18.477 − 98 =
  19. 19.171 − 56 =
  20. 20.302 − 47 =
  21. 21.451 − 79 =
  22. 22.231 − 89 =
  23. 23.245 − 27 =
  24. 24.540 − 66 =
  25. 25.412 − 19 =
  26. 26.137 − 36 =
  27. 27.362 − 68 =
  28. 28.383 − 39 =
  29. 29.284 − 26 =
  30. 30.350 − 39 =
  31. 31.324 − 37 =
  32. 32.257 − 96 =
  33. 33.250 − 88 =
  34. 34.416 − 49 =
  35. 35.167 − 28 =
  36. 36.536 − 47 =
  37. 37.538 − 68 =
  38. 38.138 − 66 =
  39. 39.452 − 77 =
  40. 40.443 − 17 =

Answer key

  1. 434
  2. 290
  3. 261
  4. 289
  5. 45
  6. 459
  7. 124
  8. 504
  9. 420
  10. 257
  11. 98
  12. 478
  13. 36
  14. 558
  15. 8
  16. 13
  17. 150
  18. 379
  19. 115
  20. 255
  21. 372
  22. 142
  23. 218
  24. 474
  25. 393
  26. 101
  27. 294
  28. 344
  29. 258
  30. 311
  31. 287
  32. 161
  33. 162
  34. 367
  35. 139
  36. 489
  37. 470
  38. 72
  39. 375
  40. 426

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