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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 53 · 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. 1.70 − 38 =
  2. 2.560 − 38 =
  3. 3.279 − 77 =
  4. 4.348 − 17 =
  5. 5.499 − 38 =
  6. 6.162 − 86 =
  7. 7.107 − 79 =
  8. 8.240 − 97 =
  9. 9.534 − 39 =
  10. 10.115 − 27 =
  11. 11.344 − 19 =
  12. 12.257 − 58 =
  13. 13.78 − 26 =
  14. 14.139 − 39 =
  15. 15.65 − 36 =
  16. 16.83 − 38 =
  17. 17.315 − 16 =
  18. 18.583 − 98 =
  19. 19.543 − 26 =
  20. 20.222 − 39 =
  21. 21.585 − 98 =
  22. 22.202 − 56 =
  23. 23.366 − 37 =
  24. 24.140 − 46 =
  25. 25.434 − 16 =
  26. 26.156 − 37 =
  27. 27.399 − 28 =
  28. 28.405 − 57 =
  29. 29.439 − 97 =
  30. 30.472 − 66 =
  31. 31.104 − 48 =
  32. 32.457 − 39 =
  33. 33.309 − 66 =
  34. 34.288 − 68 =
  35. 35.472 − 28 =
  36. 36.329 − 29 =
  37. 37.372 − 76 =
  38. 38.398 − 88 =
  39. 39.189 − 28 =
  40. 40.172 − 49 =

Answer key

  1. 32
  2. 522
  3. 202
  4. 331
  5. 461
  6. 76
  7. 28
  8. 143
  9. 495
  10. 88
  11. 325
  12. 199
  13. 52
  14. 100
  15. 29
  16. 45
  17. 299
  18. 485
  19. 517
  20. 183
  21. 487
  22. 146
  23. 329
  24. 94
  25. 418
  26. 119
  27. 371
  28. 348
  29. 342
  30. 406
  31. 56
  32. 418
  33. 243
  34. 220
  35. 444
  36. 300
  37. 296
  38. 310
  39. 161
  40. 123

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