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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 873 · 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. 1.186 − 47 =
  2. 2.227 − 88 =
  3. 3.595 − 26 =
  4. 4.306 − 37 =
  5. 5.288 − 96 =
  6. 6.112 − 18 =
  7. 7.586 − 39 =
  8. 8.443 − 36 =
  9. 9.310 − 18 =
  10. 10.574 − 27 =
  11. 11.449 − 37 =
  12. 12.539 − 37 =
  13. 13.305 − 86 =
  14. 14.106 − 96 =
  15. 15.492 − 97 =
  16. 16.190 − 48 =
  17. 17.550 − 56 =
  18. 18.296 − 66 =
  19. 19.382 − 68 =
  20. 20.105 − 96 =
  21. 21.299 − 66 =
  22. 22.176 − 89 =
  23. 23.241 − 17 =
  24. 24.57 − 28 =
  25. 25.357 − 37 =
  26. 26.480 − 17 =
  27. 27.545 − 86 =
  28. 28.484 − 47 =
  29. 29.478 − 18 =
  30. 30.345 − 68 =
  31. 31.100 − 18 =
  32. 32.143 − 86 =
  33. 33.83 − 46 =
  34. 34.575 − 66 =
  35. 35.117 − 66 =
  36. 36.451 − 96 =
  37. 37.225 − 89 =
  38. 38.302 − 17 =
  39. 39.137 − 19 =
  40. 40.175 − 86 =

Answer key

  1. 139
  2. 139
  3. 569
  4. 269
  5. 192
  6. 94
  7. 547
  8. 407
  9. 292
  10. 547
  11. 412
  12. 502
  13. 219
  14. 10
  15. 395
  16. 142
  17. 494
  18. 230
  19. 314
  20. 9
  21. 233
  22. 87
  23. 224
  24. 29
  25. 320
  26. 463
  27. 459
  28. 437
  29. 460
  30. 277
  31. 82
  32. 57
  33. 37
  34. 509
  35. 51
  36. 355
  37. 136
  38. 285
  39. 118
  40. 89

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