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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 510 · 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. 1.103 − 78 =
  2. 2.170 − 39 =
  3. 3.520 − 27 =
  4. 4.401 − 28 =
  5. 5.350 − 76 =
  6. 6.161 − 47 =
  7. 7.407 − 17 =
  8. 8.153 − 96 =
  9. 9.202 − 86 =
  10. 10.320 − 87 =
  11. 11.88 − 19 =
  12. 12.151 − 57 =
  13. 13.407 − 28 =
  14. 14.360 − 78 =
  15. 15.332 − 46 =
  16. 16.221 − 98 =
  17. 17.82 − 58 =
  18. 18.354 − 77 =
  19. 19.417 − 18 =
  20. 20.89 − 28 =
  21. 21.577 − 27 =
  22. 22.477 − 89 =
  23. 23.170 − 49 =
  24. 24.371 − 58 =
  25. 25.567 − 79 =
  26. 26.127 − 19 =
  27. 27.365 − 79 =
  28. 28.444 − 57 =
  29. 29.381 − 58 =
  30. 30.421 − 36 =
  31. 31.128 − 66 =
  32. 32.208 − 17 =
  33. 33.494 − 99 =
  34. 34.179 − 38 =
  35. 35.445 − 78 =
  36. 36.353 − 27 =
  37. 37.485 − 39 =
  38. 38.390 − 97 =
  39. 39.566 − 46 =
  40. 40.513 − 19 =

Answer key

  1. 25
  2. 131
  3. 493
  4. 373
  5. 274
  6. 114
  7. 390
  8. 57
  9. 116
  10. 233
  11. 69
  12. 94
  13. 379
  14. 282
  15. 286
  16. 123
  17. 24
  18. 277
  19. 399
  20. 61
  21. 550
  22. 388
  23. 121
  24. 313
  25. 488
  26. 108
  27. 286
  28. 387
  29. 323
  30. 385
  31. 62
  32. 191
  33. 395
  34. 141
  35. 367
  36. 326
  37. 446
  38. 293
  39. 520
  40. 494

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