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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 990 · 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. 1.160 − 49 =
  2. 2.108 − 39 =
  3. 3.226 − 16 =
  4. 4.122 − 86 =
  5. 5.578 − 96 =
  6. 6.172 − 78 =
  7. 7.146 − 78 =
  8. 8.435 − 58 =
  9. 9.422 − 26 =
  10. 10.547 − 27 =
  11. 11.127 − 36 =
  12. 12.482 − 68 =
  13. 13.159 − 77 =
  14. 14.444 − 27 =
  15. 15.392 − 69 =
  16. 16.316 − 46 =
  17. 17.442 − 48 =
  18. 18.62 − 56 =
  19. 19.181 − 39 =
  20. 20.328 − 99 =
  21. 21.107 − 96 =
  22. 22.590 − 79 =
  23. 23.192 − 29 =
  24. 24.123 − 19 =
  25. 25.595 − 36 =
  26. 26.74 − 37 =
  27. 27.212 − 96 =
  28. 28.163 − 47 =
  29. 29.197 − 96 =
  30. 30.532 − 49 =
  31. 31.587 − 36 =
  32. 32.58 − 27 =
  33. 33.489 − 36 =
  34. 34.562 − 68 =
  35. 35.381 − 49 =
  36. 36.301 − 28 =
  37. 37.425 − 57 =
  38. 38.248 − 97 =
  39. 39.543 − 88 =
  40. 40.454 − 69 =

Answer key

  1. 111
  2. 69
  3. 210
  4. 36
  5. 482
  6. 94
  7. 68
  8. 377
  9. 396
  10. 520
  11. 91
  12. 414
  13. 82
  14. 417
  15. 323
  16. 270
  17. 394
  18. 6
  19. 142
  20. 229
  21. 11
  22. 511
  23. 163
  24. 104
  25. 559
  26. 37
  27. 116
  28. 116
  29. 101
  30. 483
  31. 551
  32. 31
  33. 453
  34. 494
  35. 332
  36. 273
  37. 368
  38. 151
  39. 455
  40. 385

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