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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 977 · 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. 1.237 − 27 =
  2. 2.573 − 69 =
  3. 3.79 − 29 =
  4. 4.199 − 68 =
  5. 5.85 − 19 =
  6. 6.173 − 39 =
  7. 7.233 − 16 =
  8. 8.208 − 66 =
  9. 9.257 − 68 =
  10. 10.272 − 87 =
  11. 11.549 − 19 =
  12. 12.221 − 98 =
  13. 13.173 − 98 =
  14. 14.401 − 57 =
  15. 15.540 − 97 =
  16. 16.196 − 29 =
  17. 17.462 − 78 =
  18. 18.265 − 19 =
  19. 19.179 − 76 =
  20. 20.203 − 18 =
  21. 21.156 − 78 =
  22. 22.205 − 88 =
  23. 23.478 − 79 =
  24. 24.242 − 17 =
  25. 25.558 − 37 =
  26. 26.393 − 88 =
  27. 27.187 − 77 =
  28. 28.129 − 29 =
  29. 29.501 − 57 =
  30. 30.315 − 36 =
  31. 31.534 − 17 =
  32. 32.254 − 29 =
  33. 33.292 − 17 =
  34. 34.381 − 27 =
  35. 35.363 − 26 =
  36. 36.163 − 98 =
  37. 37.89 − 39 =
  38. 38.223 − 36 =
  39. 39.151 − 39 =
  40. 40.460 − 27 =

Answer key

  1. 210
  2. 504
  3. 50
  4. 131
  5. 66
  6. 134
  7. 217
  8. 142
  9. 189
  10. 185
  11. 530
  12. 123
  13. 75
  14. 344
  15. 443
  16. 167
  17. 384
  18. 246
  19. 103
  20. 185
  21. 78
  22. 117
  23. 399
  24. 225
  25. 521
  26. 305
  27. 110
  28. 100
  29. 444
  30. 279
  31. 517
  32. 225
  33. 275
  34. 354
  35. 337
  36. 65
  37. 50
  38. 187
  39. 112
  40. 433

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