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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 413 · 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. 1.371 − 47 =
  2. 2.108 − 26 =
  3. 3.330 − 79 =
  4. 4.193 − 96 =
  5. 5.389 − 98 =
  6. 6.376 − 47 =
  7. 7.323 − 98 =
  8. 8.247 − 79 =
  9. 9.123 − 77 =
  10. 10.352 − 27 =
  11. 11.178 − 39 =
  12. 12.428 − 36 =
  13. 13.115 − 57 =
  14. 14.394 − 27 =
  15. 15.332 − 39 =
  16. 16.293 − 28 =
  17. 17.448 − 57 =
  18. 18.594 − 99 =
  19. 19.62 − 16 =
  20. 20.302 − 76 =
  21. 21.480 − 38 =
  22. 22.352 − 49 =
  23. 23.458 − 96 =
  24. 24.133 − 79 =
  25. 25.276 − 17 =
  26. 26.70 − 48 =
  27. 27.253 − 68 =
  28. 28.347 − 47 =
  29. 29.177 − 57 =
  30. 30.233 − 46 =
  31. 31.139 − 78 =
  32. 32.230 − 59 =
  33. 33.351 − 78 =
  34. 34.122 − 79 =
  35. 35.276 − 36 =
  36. 36.353 − 98 =
  37. 37.420 − 16 =
  38. 38.161 − 79 =
  39. 39.73 − 16 =
  40. 40.537 − 28 =

Answer key

  1. 324
  2. 82
  3. 251
  4. 97
  5. 291
  6. 329
  7. 225
  8. 168
  9. 46
  10. 325
  11. 139
  12. 392
  13. 58
  14. 367
  15. 293
  16. 265
  17. 391
  18. 495
  19. 46
  20. 226
  21. 442
  22. 303
  23. 362
  24. 54
  25. 259
  26. 22
  27. 185
  28. 300
  29. 120
  30. 187
  31. 61
  32. 171
  33. 273
  34. 43
  35. 240
  36. 255
  37. 404
  38. 82
  39. 57
  40. 509

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