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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 665 · 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. 1.488 − 86 =
  2. 2.533 − 48 =
  3. 3.143 − 58 =
  4. 4.191 − 98 =
  5. 5.207 − 16 =
  6. 6.566 − 29 =
  7. 7.524 − 66 =
  8. 8.331 − 86 =
  9. 9.530 − 89 =
  10. 10.476 − 27 =
  11. 11.490 − 36 =
  12. 12.268 − 77 =
  13. 13.61 − 16 =
  14. 14.71 − 17 =
  15. 15.122 − 87 =
  16. 16.155 − 69 =
  17. 17.348 − 18 =
  18. 18.120 − 26 =
  19. 19.536 − 89 =
  20. 20.332 − 17 =
  21. 21.312 − 67 =
  22. 22.385 − 48 =
  23. 23.213 − 66 =
  24. 24.519 − 76 =
  25. 25.189 − 36 =
  26. 26.273 − 56 =
  27. 27.530 − 16 =
  28. 28.522 − 68 =
  29. 29.59 − 16 =
  30. 30.74 − 67 =
  31. 31.193 − 86 =
  32. 32.433 − 36 =
  33. 33.499 − 89 =
  34. 34.185 − 16 =
  35. 35.243 − 38 =
  36. 36.257 − 79 =
  37. 37.235 − 57 =
  38. 38.342 − 48 =
  39. 39.282 − 99 =
  40. 40.346 − 46 =

Answer key

  1. 402
  2. 485
  3. 85
  4. 93
  5. 191
  6. 537
  7. 458
  8. 245
  9. 441
  10. 449
  11. 454
  12. 191
  13. 45
  14. 54
  15. 35
  16. 86
  17. 330
  18. 94
  19. 447
  20. 315
  21. 245
  22. 337
  23. 147
  24. 443
  25. 153
  26. 217
  27. 514
  28. 454
  29. 43
  30. 7
  31. 107
  32. 397
  33. 410
  34. 169
  35. 205
  36. 178
  37. 178
  38. 294
  39. 183
  40. 300

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