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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 838 · 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. 1.542 − 27 =
  2. 2.499 − 66 =
  3. 3.574 − 49 =
  4. 4.397 − 96 =
  5. 5.568 − 88 =
  6. 6.268 − 98 =
  7. 7.448 − 19 =
  8. 8.137 − 96 =
  9. 9.308 − 79 =
  10. 10.76 − 68 =
  11. 11.514 − 66 =
  12. 12.151 − 19 =
  13. 13.211 − 26 =
  14. 14.162 − 49 =
  15. 15.437 − 16 =
  16. 16.115 − 66 =
  17. 17.158 − 46 =
  18. 18.158 − 97 =
  19. 19.428 − 66 =
  20. 20.163 − 38 =
  21. 21.290 − 46 =
  22. 22.290 − 69 =
  23. 23.357 − 59 =
  24. 24.349 − 86 =
  25. 25.260 − 56 =
  26. 26.491 − 76 =
  27. 27.166 − 28 =
  28. 28.236 − 27 =
  29. 29.139 − 88 =
  30. 30.172 − 67 =
  31. 31.375 − 47 =
  32. 32.247 − 88 =
  33. 33.365 − 76 =
  34. 34.228 − 77 =
  35. 35.422 − 29 =
  36. 36.309 − 39 =
  37. 37.586 − 57 =
  38. 38.596 − 26 =
  39. 39.65 − 29 =
  40. 40.86 − 78 =

Answer key

  1. 515
  2. 433
  3. 525
  4. 301
  5. 480
  6. 170
  7. 429
  8. 41
  9. 229
  10. 8
  11. 448
  12. 132
  13. 185
  14. 113
  15. 421
  16. 49
  17. 112
  18. 61
  19. 362
  20. 125
  21. 244
  22. 221
  23. 298
  24. 263
  25. 204
  26. 415
  27. 138
  28. 209
  29. 51
  30. 105
  31. 328
  32. 159
  33. 289
  34. 151
  35. 393
  36. 270
  37. 529
  38. 570
  39. 36
  40. 8

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