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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 606 · 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. 1.322 − 48 =
  2. 2.581 − 87 =
  3. 3.306 − 17 =
  4. 4.246 − 29 =
  5. 5.560 − 57 =
  6. 6.203 − 39 =
  7. 7.325 − 27 =
  8. 8.75 − 26 =
  9. 9.151 − 66 =
  10. 10.201 − 98 =
  11. 11.223 − 48 =
  12. 12.255 − 86 =
  13. 13.510 − 36 =
  14. 14.257 − 87 =
  15. 15.391 − 49 =
  16. 16.418 − 18 =
  17. 17.451 − 46 =
  18. 18.109 − 28 =
  19. 19.383 − 27 =
  20. 20.415 − 49 =
  21. 21.76 − 18 =
  22. 22.238 − 46 =
  23. 23.247 − 47 =
  24. 24.421 − 48 =
  25. 25.185 − 66 =
  26. 26.447 − 67 =
  27. 27.259 − 27 =
  28. 28.63 − 56 =
  29. 29.508 − 56 =
  30. 30.573 − 97 =
  31. 31.171 − 16 =
  32. 32.528 − 16 =
  33. 33.306 − 28 =
  34. 34.367 − 59 =
  35. 35.177 − 28 =
  36. 36.485 − 66 =
  37. 37.82 − 29 =
  38. 38.507 − 57 =
  39. 39.548 − 56 =
  40. 40.340 − 48 =

Answer key

  1. 274
  2. 494
  3. 289
  4. 217
  5. 503
  6. 164
  7. 298
  8. 49
  9. 85
  10. 103
  11. 175
  12. 169
  13. 474
  14. 170
  15. 342
  16. 400
  17. 405
  18. 81
  19. 356
  20. 366
  21. 58
  22. 192
  23. 200
  24. 373
  25. 119
  26. 380
  27. 232
  28. 7
  29. 452
  30. 476
  31. 155
  32. 512
  33. 278
  34. 308
  35. 149
  36. 419
  37. 53
  38. 450
  39. 492
  40. 292

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