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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 679 · 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. 1.172 − 99 =
  2. 2.264 − 19 =
  3. 3.180 − 39 =
  4. 4.258 − 16 =
  5. 5.289 − 59 =
  6. 6.479 − 79 =
  7. 7.235 − 79 =
  8. 8.95 − 46 =
  9. 9.130 − 48 =
  10. 10.333 − 66 =
  11. 11.85 − 38 =
  12. 12.551 − 37 =
  13. 13.512 − 56 =
  14. 14.85 − 67 =
  15. 15.591 − 28 =
  16. 16.348 − 38 =
  17. 17.430 − 48 =
  18. 18.118 − 56 =
  19. 19.211 − 76 =
  20. 20.168 − 26 =
  21. 21.407 − 39 =
  22. 22.535 − 26 =
  23. 23.372 − 17 =
  24. 24.263 − 27 =
  25. 25.371 − 39 =
  26. 26.248 − 17 =
  27. 27.124 − 86 =
  28. 28.179 − 86 =
  29. 29.402 − 16 =
  30. 30.548 − 69 =
  31. 31.323 − 47 =
  32. 32.53 − 26 =
  33. 33.102 − 17 =
  34. 34.310 − 58 =
  35. 35.353 − 97 =
  36. 36.566 − 37 =
  37. 37.171 − 38 =
  38. 38.402 − 37 =
  39. 39.330 − 28 =
  40. 40.447 − 67 =

Answer key

  1. 73
  2. 245
  3. 141
  4. 242
  5. 230
  6. 400
  7. 156
  8. 49
  9. 82
  10. 267
  11. 47
  12. 514
  13. 456
  14. 18
  15. 563
  16. 310
  17. 382
  18. 62
  19. 135
  20. 142
  21. 368
  22. 509
  23. 355
  24. 236
  25. 332
  26. 231
  27. 38
  28. 93
  29. 386
  30. 479
  31. 276
  32. 27
  33. 85
  34. 252
  35. 256
  36. 529
  37. 133
  38. 365
  39. 302
  40. 380

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