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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 478 · 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. 1.576 − 36 =
  2. 2.433 − 87 =
  3. 3.565 − 99 =
  4. 4.179 − 89 =
  5. 5.232 − 66 =
  6. 6.357 − 36 =
  7. 7.222 − 18 =
  8. 8.496 − 38 =
  9. 9.563 − 19 =
  10. 10.81 − 29 =
  11. 11.300 − 78 =
  12. 12.326 − 18 =
  13. 13.131 − 27 =
  14. 14.585 − 46 =
  15. 15.318 − 18 =
  16. 16.549 − 77 =
  17. 17.208 − 96 =
  18. 18.257 − 96 =
  19. 19.371 − 26 =
  20. 20.262 − 18 =
  21. 21.566 − 99 =
  22. 22.207 − 37 =
  23. 23.200 − 67 =
  24. 24.252 − 69 =
  25. 25.390 − 26 =
  26. 26.245 − 69 =
  27. 27.522 − 19 =
  28. 28.207 − 18 =
  29. 29.88 − 27 =
  30. 30.123 − 76 =
  31. 31.588 − 27 =
  32. 32.242 − 89 =
  33. 33.228 − 37 =
  34. 34.158 − 69 =
  35. 35.243 − 49 =
  36. 36.348 − 58 =
  37. 37.539 − 97 =
  38. 38.92 − 26 =
  39. 39.432 − 49 =
  40. 40.348 − 77 =

Answer key

  1. 540
  2. 346
  3. 466
  4. 90
  5. 166
  6. 321
  7. 204
  8. 458
  9. 544
  10. 52
  11. 222
  12. 308
  13. 104
  14. 539
  15. 300
  16. 472
  17. 112
  18. 161
  19. 345
  20. 244
  21. 467
  22. 170
  23. 133
  24. 183
  25. 364
  26. 176
  27. 503
  28. 189
  29. 61
  30. 47
  31. 561
  32. 153
  33. 191
  34. 89
  35. 194
  36. 290
  37. 442
  38. 66
  39. 383
  40. 271

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