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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 922 · 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. 1.304 − 66 =
  2. 2.225 − 16 =
  3. 3.202 − 76 =
  4. 4.379 − 76 =
  5. 5.492 − 77 =
  6. 6.140 − 87 =
  7. 7.183 − 28 =
  8. 8.597 − 87 =
  9. 9.241 − 66 =
  10. 10.532 − 16 =
  11. 11.278 − 99 =
  12. 12.443 − 66 =
  13. 13.471 − 86 =
  14. 14.96 − 88 =
  15. 15.327 − 96 =
  16. 16.420 − 38 =
  17. 17.467 − 69 =
  18. 18.155 − 47 =
  19. 19.183 − 86 =
  20. 20.433 − 88 =
  21. 21.512 − 58 =
  22. 22.86 − 17 =
  23. 23.488 − 76 =
  24. 24.471 − 49 =
  25. 25.109 − 99 =
  26. 26.284 − 88 =
  27. 27.121 − 29 =
  28. 28.553 − 76 =
  29. 29.124 − 79 =
  30. 30.431 − 79 =
  31. 31.580 − 39 =
  32. 32.464 − 17 =
  33. 33.227 − 59 =
  34. 34.82 − 17 =
  35. 35.406 − 17 =
  36. 36.503 − 76 =
  37. 37.178 − 26 =
  38. 38.246 − 38 =
  39. 39.507 − 48 =
  40. 40.188 − 66 =

Answer key

  1. 238
  2. 209
  3. 126
  4. 303
  5. 415
  6. 53
  7. 155
  8. 510
  9. 175
  10. 516
  11. 179
  12. 377
  13. 385
  14. 8
  15. 231
  16. 382
  17. 398
  18. 108
  19. 97
  20. 345
  21. 454
  22. 69
  23. 412
  24. 422
  25. 10
  26. 196
  27. 92
  28. 477
  29. 45
  30. 352
  31. 541
  32. 447
  33. 168
  34. 65
  35. 389
  36. 427
  37. 152
  38. 208
  39. 459
  40. 122

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