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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 282 · 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. 1.336 − 28 =
  2. 2.426 − 29 =
  3. 3.255 − 68 =
  4. 4.330 − 17 =
  5. 5.161 − 19 =
  6. 6.506 − 19 =
  7. 7.400 − 57 =
  8. 8.219 − 37 =
  9. 9.333 − 36 =
  10. 10.278 − 87 =
  11. 11.556 − 67 =
  12. 12.362 − 78 =
  13. 13.350 − 89 =
  14. 14.406 − 49 =
  15. 15.493 − 56 =
  16. 16.326 − 89 =
  17. 17.96 − 88 =
  18. 18.247 − 18 =
  19. 19.247 − 36 =
  20. 20.112 − 46 =
  21. 21.173 − 97 =
  22. 22.564 − 87 =
  23. 23.119 − 48 =
  24. 24.187 − 48 =
  25. 25.447 − 88 =
  26. 26.450 − 16 =
  27. 27.396 − 96 =
  28. 28.547 − 19 =
  29. 29.427 − 69 =
  30. 30.241 − 86 =
  31. 31.94 − 68 =
  32. 32.378 − 96 =
  33. 33.140 − 66 =
  34. 34.293 − 78 =
  35. 35.68 − 18 =
  36. 36.111 − 29 =
  37. 37.191 − 86 =
  38. 38.528 − 97 =
  39. 39.437 − 79 =
  40. 40.352 − 19 =

Answer key

  1. 308
  2. 397
  3. 187
  4. 313
  5. 142
  6. 487
  7. 343
  8. 182
  9. 297
  10. 191
  11. 489
  12. 284
  13. 261
  14. 357
  15. 437
  16. 237
  17. 8
  18. 229
  19. 211
  20. 66
  21. 76
  22. 477
  23. 71
  24. 139
  25. 359
  26. 434
  27. 300
  28. 528
  29. 358
  30. 155
  31. 26
  32. 282
  33. 74
  34. 215
  35. 50
  36. 82
  37. 105
  38. 431
  39. 358
  40. 333

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