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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 428 · 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. 1.439 − 18 =
  2. 2.460 − 59 =
  3. 3.70 − 26 =
  4. 4.284 − 37 =
  5. 5.194 − 68 =
  6. 6.456 − 18 =
  7. 7.582 − 67 =
  8. 8.300 − 36 =
  9. 9.458 − 48 =
  10. 10.454 − 26 =
  11. 11.269 − 58 =
  12. 12.277 − 58 =
  13. 13.492 − 86 =
  14. 14.524 − 69 =
  15. 15.372 − 68 =
  16. 16.239 − 56 =
  17. 17.462 − 39 =
  18. 18.297 − 27 =
  19. 19.201 − 79 =
  20. 20.515 − 46 =
  21. 21.160 − 37 =
  22. 22.65 − 57 =
  23. 23.184 − 87 =
  24. 24.498 − 29 =
  25. 25.533 − 86 =
  26. 26.159 − 66 =
  27. 27.167 − 68 =
  28. 28.176 − 87 =
  29. 29.372 − 77 =
  30. 30.424 − 39 =
  31. 31.121 − 76 =
  32. 32.569 − 96 =
  33. 33.152 − 29 =
  34. 34.125 − 88 =
  35. 35.585 − 98 =
  36. 36.206 − 18 =
  37. 37.171 − 48 =
  38. 38.452 − 78 =
  39. 39.89 − 77 =
  40. 40.59 − 17 =

Answer key

  1. 421
  2. 401
  3. 44
  4. 247
  5. 126
  6. 438
  7. 515
  8. 264
  9. 410
  10. 428
  11. 211
  12. 219
  13. 406
  14. 455
  15. 304
  16. 183
  17. 423
  18. 270
  19. 122
  20. 469
  21. 123
  22. 8
  23. 97
  24. 469
  25. 447
  26. 93
  27. 99
  28. 89
  29. 295
  30. 385
  31. 45
  32. 473
  33. 123
  34. 37
  35. 487
  36. 188
  37. 123
  38. 374
  39. 12
  40. 42

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