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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 198 · 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. 1.99 − 18 =
  2. 2.317 − 28 =
  3. 3.179 − 27 =
  4. 4.381 − 17 =
  5. 5.529 − 56 =
  6. 6.130 − 17 =
  7. 7.141 − 19 =
  8. 8.419 − 96 =
  9. 9.366 − 36 =
  10. 10.545 − 67 =
  11. 11.320 − 19 =
  12. 12.356 − 46 =
  13. 13.494 − 67 =
  14. 14.188 − 39 =
  15. 15.503 − 98 =
  16. 16.534 − 26 =
  17. 17.427 − 59 =
  18. 18.369 − 16 =
  19. 19.322 − 57 =
  20. 20.380 − 76 =
  21. 21.251 − 97 =
  22. 22.239 − 56 =
  23. 23.424 − 78 =
  24. 24.75 − 48 =
  25. 25.190 − 67 =
  26. 26.379 − 68 =
  27. 27.145 − 78 =
  28. 28.146 − 17 =
  29. 29.132 − 58 =
  30. 30.371 − 36 =
  31. 31.361 − 28 =
  32. 32.175 − 18 =
  33. 33.516 − 49 =
  34. 34.159 − 98 =
  35. 35.303 − 86 =
  36. 36.481 − 26 =
  37. 37.267 − 26 =
  38. 38.444 − 46 =
  39. 39.201 − 46 =
  40. 40.119 − 26 =

Answer key

  1. 81
  2. 289
  3. 152
  4. 364
  5. 473
  6. 113
  7. 122
  8. 323
  9. 330
  10. 478
  11. 301
  12. 310
  13. 427
  14. 149
  15. 405
  16. 508
  17. 368
  18. 353
  19. 265
  20. 304
  21. 154
  22. 183
  23. 346
  24. 27
  25. 123
  26. 311
  27. 67
  28. 129
  29. 74
  30. 335
  31. 333
  32. 157
  33. 467
  34. 61
  35. 217
  36. 455
  37. 241
  38. 398
  39. 155
  40. 93

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