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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 492 · 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. 1.517 − 28 =
  2. 2.527 − 89 =
  3. 3.172 − 89 =
  4. 4.441 − 18 =
  5. 5.56 − 49 =
  6. 6.398 − 66 =
  7. 7.202 − 38 =
  8. 8.258 − 69 =
  9. 9.330 − 49 =
  10. 10.418 − 29 =
  11. 11.62 − 27 =
  12. 12.204 − 38 =
  13. 13.157 − 79 =
  14. 14.539 − 56 =
  15. 15.485 − 99 =
  16. 16.523 − 59 =
  17. 17.353 − 67 =
  18. 18.377 − 66 =
  19. 19.573 − 88 =
  20. 20.182 − 38 =
  21. 21.546 − 56 =
  22. 22.424 − 18 =
  23. 23.173 − 56 =
  24. 24.530 − 86 =
  25. 25.425 − 67 =
  26. 26.229 − 26 =
  27. 27.126 − 78 =
  28. 28.86 − 59 =
  29. 29.497 − 78 =
  30. 30.58 − 19 =
  31. 31.545 − 66 =
  32. 32.564 − 79 =
  33. 33.277 − 79 =
  34. 34.152 − 89 =
  35. 35.471 − 98 =
  36. 36.348 − 67 =
  37. 37.573 − 57 =
  38. 38.238 − 46 =
  39. 39.142 − 89 =
  40. 40.189 − 96 =

Answer key

  1. 489
  2. 438
  3. 83
  4. 423
  5. 7
  6. 332
  7. 164
  8. 189
  9. 281
  10. 389
  11. 35
  12. 166
  13. 78
  14. 483
  15. 386
  16. 464
  17. 286
  18. 311
  19. 485
  20. 144
  21. 490
  22. 406
  23. 117
  24. 444
  25. 358
  26. 203
  27. 48
  28. 27
  29. 419
  30. 39
  31. 479
  32. 485
  33. 198
  34. 63
  35. 373
  36. 281
  37. 516
  38. 192
  39. 53
  40. 93

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