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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 199 · 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. 1.181 − 48 =
  2. 2.538 − 79 =
  3. 3.388 − 88 =
  4. 4.360 − 46 =
  5. 5.239 − 86 =
  6. 6.158 − 36 =
  7. 7.325 − 38 =
  8. 8.74 − 18 =
  9. 9.440 − 78 =
  10. 10.84 − 18 =
  11. 11.163 − 86 =
  12. 12.457 − 38 =
  13. 13.509 − 57 =
  14. 14.240 − 39 =
  15. 15.546 − 27 =
  16. 16.473 − 69 =
  17. 17.59 − 19 =
  18. 18.586 − 78 =
  19. 19.531 − 29 =
  20. 20.323 − 67 =
  21. 21.187 − 36 =
  22. 22.57 − 16 =
  23. 23.475 − 86 =
  24. 24.236 − 89 =
  25. 25.128 − 69 =
  26. 26.472 − 48 =
  27. 27.568 − 47 =
  28. 28.181 − 79 =
  29. 29.343 − 76 =
  30. 30.534 − 57 =
  31. 31.218 − 47 =
  32. 32.165 − 16 =
  33. 33.319 − 96 =
  34. 34.571 − 28 =
  35. 35.261 − 37 =
  36. 36.204 − 38 =
  37. 37.73 − 46 =
  38. 38.344 − 98 =
  39. 39.329 − 47 =
  40. 40.286 − 96 =

Answer key

  1. 133
  2. 459
  3. 300
  4. 314
  5. 153
  6. 122
  7. 287
  8. 56
  9. 362
  10. 66
  11. 77
  12. 419
  13. 452
  14. 201
  15. 519
  16. 404
  17. 40
  18. 508
  19. 502
  20. 256
  21. 151
  22. 41
  23. 389
  24. 147
  25. 59
  26. 424
  27. 521
  28. 102
  29. 267
  30. 477
  31. 171
  32. 149
  33. 223
  34. 543
  35. 224
  36. 166
  37. 27
  38. 246
  39. 282
  40. 190

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