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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 754 · 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. 1.331 − 39 =
  2. 2.383 − 19 =
  3. 3.568 − 57 =
  4. 4.126 − 77 =
  5. 5.397 − 19 =
  6. 6.165 − 77 =
  7. 7.78 − 36 =
  8. 8.330 − 27 =
  9. 9.424 − 18 =
  10. 10.554 − 26 =
  11. 11.491 − 76 =
  12. 12.133 − 18 =
  13. 13.117 − 69 =
  14. 14.107 − 28 =
  15. 15.157 − 86 =
  16. 16.305 − 58 =
  17. 17.416 − 99 =
  18. 18.155 − 47 =
  19. 19.129 − 18 =
  20. 20.371 − 18 =
  21. 21.419 − 76 =
  22. 22.78 − 16 =
  23. 23.587 − 87 =
  24. 24.312 − 18 =
  25. 25.571 − 57 =
  26. 26.290 − 17 =
  27. 27.185 − 29 =
  28. 28.367 − 36 =
  29. 29.346 − 36 =
  30. 30.418 − 97 =
  31. 31.68 − 26 =
  32. 32.93 − 48 =
  33. 33.377 − 79 =
  34. 34.170 − 97 =
  35. 35.85 − 27 =
  36. 36.138 − 46 =
  37. 37.545 − 57 =
  38. 38.560 − 49 =
  39. 39.553 − 89 =
  40. 40.348 − 38 =

Answer key

  1. 292
  2. 364
  3. 511
  4. 49
  5. 378
  6. 88
  7. 42
  8. 303
  9. 406
  10. 528
  11. 415
  12. 115
  13. 48
  14. 79
  15. 71
  16. 247
  17. 317
  18. 108
  19. 111
  20. 353
  21. 343
  22. 62
  23. 500
  24. 294
  25. 514
  26. 273
  27. 156
  28. 331
  29. 310
  30. 321
  31. 42
  32. 45
  33. 298
  34. 73
  35. 58
  36. 92
  37. 488
  38. 511
  39. 464
  40. 310

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