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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 948 · 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. 1.469 − 18 =
  2. 2.471 − 28 =
  3. 3.272 − 27 =
  4. 4.453 − 79 =
  5. 5.344 − 39 =
  6. 6.203 − 26 =
  7. 7.209 − 68 =
  8. 8.80 − 58 =
  9. 9.169 − 96 =
  10. 10.150 − 97 =
  11. 11.352 − 56 =
  12. 12.198 − 17 =
  13. 13.409 − 86 =
  14. 14.507 − 27 =
  15. 15.486 − 67 =
  16. 16.107 − 59 =
  17. 17.423 − 37 =
  18. 18.405 − 46 =
  19. 19.99 − 57 =
  20. 20.547 − 48 =
  21. 21.183 − 98 =
  22. 22.480 − 86 =
  23. 23.598 − 56 =
  24. 24.230 − 49 =
  25. 25.590 − 86 =
  26. 26.136 − 87 =
  27. 27.339 − 69 =
  28. 28.387 − 66 =
  29. 29.576 − 17 =
  30. 30.461 − 38 =
  31. 31.207 − 56 =
  32. 32.267 − 29 =
  33. 33.369 − 28 =
  34. 34.126 − 18 =
  35. 35.335 − 86 =
  36. 36.314 − 16 =
  37. 37.546 − 79 =
  38. 38.366 − 79 =
  39. 39.142 − 78 =
  40. 40.172 − 96 =

Answer key

  1. 451
  2. 443
  3. 245
  4. 374
  5. 305
  6. 177
  7. 141
  8. 22
  9. 73
  10. 53
  11. 296
  12. 181
  13. 323
  14. 480
  15. 419
  16. 48
  17. 386
  18. 359
  19. 42
  20. 499
  21. 85
  22. 394
  23. 542
  24. 181
  25. 504
  26. 49
  27. 270
  28. 321
  29. 559
  30. 423
  31. 151
  32. 238
  33. 341
  34. 108
  35. 249
  36. 298
  37. 467
  38. 287
  39. 64
  40. 76

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