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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 833 · 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. 1.68 − 16 =
  2. 2.142 − 87 =
  3. 3.453 − 86 =
  4. 4.423 − 86 =
  5. 5.89 − 39 =
  6. 6.374 − 98 =
  7. 7.212 − 36 =
  8. 8.222 − 18 =
  9. 9.185 − 97 =
  10. 10.400 − 69 =
  11. 11.500 − 79 =
  12. 12.62 − 59 =
  13. 13.184 − 28 =
  14. 14.220 − 97 =
  15. 15.347 − 66 =
  16. 16.309 − 36 =
  17. 17.405 − 26 =
  18. 18.186 − 37 =
  19. 19.288 − 77 =
  20. 20.121 − 36 =
  21. 21.527 − 78 =
  22. 22.234 − 18 =
  23. 23.551 − 48 =
  24. 24.595 − 66 =
  25. 25.565 − 38 =
  26. 26.242 − 57 =
  27. 27.341 − 57 =
  28. 28.435 − 88 =
  29. 29.135 − 27 =
  30. 30.93 − 87 =
  31. 31.586 − 47 =
  32. 32.213 − 67 =
  33. 33.299 − 49 =
  34. 34.424 − 46 =
  35. 35.402 − 58 =
  36. 36.596 − 46 =
  37. 37.514 − 56 =
  38. 38.113 − 39 =
  39. 39.380 − 76 =
  40. 40.54 − 37 =

Answer key

  1. 52
  2. 55
  3. 367
  4. 337
  5. 50
  6. 276
  7. 176
  8. 204
  9. 88
  10. 331
  11. 421
  12. 3
  13. 156
  14. 123
  15. 281
  16. 273
  17. 379
  18. 149
  19. 211
  20. 85
  21. 449
  22. 216
  23. 503
  24. 529
  25. 527
  26. 185
  27. 284
  28. 347
  29. 108
  30. 6
  31. 539
  32. 146
  33. 250
  34. 378
  35. 344
  36. 550
  37. 458
  38. 74
  39. 304
  40. 17

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