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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 791 · 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. 1.544 − 36 =
  2. 2.457 − 27 =
  3. 3.316 − 37 =
  4. 4.487 − 98 =
  5. 5.146 − 17 =
  6. 6.136 − 87 =
  7. 7.414 − 66 =
  8. 8.166 − 56 =
  9. 9.413 − 57 =
  10. 10.79 − 16 =
  11. 11.412 − 18 =
  12. 12.491 − 78 =
  13. 13.344 − 18 =
  14. 14.513 − 99 =
  15. 15.338 − 28 =
  16. 16.313 − 38 =
  17. 17.144 − 66 =
  18. 18.293 − 49 =
  19. 19.126 − 49 =
  20. 20.165 − 79 =
  21. 21.325 − 77 =
  22. 22.399 − 36 =
  23. 23.242 − 39 =
  24. 24.266 − 16 =
  25. 25.295 − 76 =
  26. 26.122 − 79 =
  27. 27.71 − 66 =
  28. 28.388 − 68 =
  29. 29.460 − 49 =
  30. 30.113 − 79 =
  31. 31.201 − 46 =
  32. 32.557 − 67 =
  33. 33.73 − 39 =
  34. 34.387 − 68 =
  35. 35.188 − 37 =
  36. 36.342 − 66 =
  37. 37.390 − 86 =
  38. 38.551 − 77 =
  39. 39.361 − 88 =
  40. 40.537 − 56 =

Answer key

  1. 508
  2. 430
  3. 279
  4. 389
  5. 129
  6. 49
  7. 348
  8. 110
  9. 356
  10. 63
  11. 394
  12. 413
  13. 326
  14. 414
  15. 310
  16. 275
  17. 78
  18. 244
  19. 77
  20. 86
  21. 248
  22. 363
  23. 203
  24. 250
  25. 219
  26. 43
  27. 5
  28. 320
  29. 411
  30. 34
  31. 155
  32. 490
  33. 34
  34. 319
  35. 151
  36. 276
  37. 304
  38. 474
  39. 273
  40. 481

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