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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 670 · 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. 1.590 − 76 =
  2. 2.61 − 27 =
  3. 3.199 − 27 =
  4. 4.241 − 79 =
  5. 5.102 − 26 =
  6. 6.402 − 19 =
  7. 7.92 − 88 =
  8. 8.100 − 49 =
  9. 9.212 − 48 =
  10. 10.152 − 17 =
  11. 11.423 − 19 =
  12. 12.502 − 66 =
  13. 13.559 − 99 =
  14. 14.452 − 59 =
  15. 15.231 − 87 =
  16. 16.463 − 76 =
  17. 17.164 − 68 =
  18. 18.57 − 19 =
  19. 19.502 − 27 =
  20. 20.352 − 39 =
  21. 21.176 − 98 =
  22. 22.442 − 77 =
  23. 23.112 − 26 =
  24. 24.576 − 36 =
  25. 25.198 − 29 =
  26. 26.149 − 39 =
  27. 27.361 − 76 =
  28. 28.343 − 98 =
  29. 29.200 − 27 =
  30. 30.202 − 96 =
  31. 31.506 − 19 =
  32. 32.167 − 59 =
  33. 33.275 − 49 =
  34. 34.519 − 27 =
  35. 35.188 − 26 =
  36. 36.106 − 89 =
  37. 37.551 − 28 =
  38. 38.209 − 38 =
  39. 39.439 − 48 =
  40. 40.224 − 97 =

Answer key

  1. 514
  2. 34
  3. 172
  4. 162
  5. 76
  6. 383
  7. 4
  8. 51
  9. 164
  10. 135
  11. 404
  12. 436
  13. 460
  14. 393
  15. 144
  16. 387
  17. 96
  18. 38
  19. 475
  20. 313
  21. 78
  22. 365
  23. 86
  24. 540
  25. 169
  26. 110
  27. 285
  28. 245
  29. 173
  30. 106
  31. 487
  32. 108
  33. 226
  34. 492
  35. 162
  36. 17
  37. 523
  38. 171
  39. 391
  40. 127

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