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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 391 · 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. 1.481 − 88 =
  2. 2.123 − 38 =
  3. 3.506 − 89 =
  4. 4.465 − 96 =
  5. 5.514 − 96 =
  6. 6.269 − 29 =
  7. 7.148 − 79 =
  8. 8.421 − 28 =
  9. 9.461 − 48 =
  10. 10.512 − 58 =
  11. 11.410 − 16 =
  12. 12.457 − 26 =
  13. 13.320 − 26 =
  14. 14.164 − 58 =
  15. 15.558 − 56 =
  16. 16.446 − 37 =
  17. 17.526 − 18 =
  18. 18.187 − 76 =
  19. 19.423 − 29 =
  20. 20.556 − 17 =
  21. 21.295 − 16 =
  22. 22.284 − 78 =
  23. 23.97 − 26 =
  24. 24.319 − 69 =
  25. 25.422 − 89 =
  26. 26.131 − 28 =
  27. 27.425 − 46 =
  28. 28.141 − 29 =
  29. 29.306 − 28 =
  30. 30.560 − 17 =
  31. 31.163 − 98 =
  32. 32.243 − 48 =
  33. 33.170 − 98 =
  34. 34.76 − 66 =
  35. 35.155 − 77 =
  36. 36.556 − 78 =
  37. 37.534 − 87 =
  38. 38.371 − 78 =
  39. 39.266 − 67 =
  40. 40.340 − 38 =

Answer key

  1. 393
  2. 85
  3. 417
  4. 369
  5. 418
  6. 240
  7. 69
  8. 393
  9. 413
  10. 454
  11. 394
  12. 431
  13. 294
  14. 106
  15. 502
  16. 409
  17. 508
  18. 111
  19. 394
  20. 539
  21. 279
  22. 206
  23. 71
  24. 250
  25. 333
  26. 103
  27. 379
  28. 112
  29. 278
  30. 543
  31. 65
  32. 195
  33. 72
  34. 10
  35. 78
  36. 478
  37. 447
  38. 293
  39. 199
  40. 302

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