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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 926 · 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. 1.312 − 79 =
  2. 2.519 − 97 =
  3. 3.194 − 68 =
  4. 4.365 − 16 =
  5. 5.111 − 56 =
  6. 6.92 − 37 =
  7. 7.187 − 97 =
  8. 8.478 − 17 =
  9. 9.585 − 96 =
  10. 10.145 − 87 =
  11. 11.100 − 29 =
  12. 12.123 − 46 =
  13. 13.594 − 48 =
  14. 14.591 − 26 =
  15. 15.77 − 18 =
  16. 16.235 − 49 =
  17. 17.330 − 89 =
  18. 18.321 − 17 =
  19. 19.589 − 76 =
  20. 20.516 − 58 =
  21. 21.415 − 59 =
  22. 22.180 − 49 =
  23. 23.345 − 29 =
  24. 24.96 − 46 =
  25. 25.594 − 16 =
  26. 26.160 − 29 =
  27. 27.233 − 99 =
  28. 28.502 − 97 =
  29. 29.80 − 37 =
  30. 30.174 − 66 =
  31. 31.245 − 38 =
  32. 32.171 − 18 =
  33. 33.71 − 48 =
  34. 34.400 − 46 =
  35. 35.370 − 36 =
  36. 36.392 − 88 =
  37. 37.185 − 37 =
  38. 38.458 − 87 =
  39. 39.599 − 78 =
  40. 40.185 − 46 =

Answer key

  1. 233
  2. 422
  3. 126
  4. 349
  5. 55
  6. 55
  7. 90
  8. 461
  9. 489
  10. 58
  11. 71
  12. 77
  13. 546
  14. 565
  15. 59
  16. 186
  17. 241
  18. 304
  19. 513
  20. 458
  21. 356
  22. 131
  23. 316
  24. 50
  25. 578
  26. 131
  27. 134
  28. 405
  29. 43
  30. 108
  31. 207
  32. 153
  33. 23
  34. 354
  35. 334
  36. 304
  37. 148
  38. 371
  39. 521
  40. 139

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