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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 45 · 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. 1.71 − 39 =
  2. 2.357 − 16 =
  3. 3.376 − 48 =
  4. 4.341 − 69 =
  5. 5.124 − 78 =
  6. 6.155 − 66 =
  7. 7.594 − 27 =
  8. 8.441 − 66 =
  9. 9.561 − 36 =
  10. 10.276 − 29 =
  11. 11.448 − 78 =
  12. 12.376 − 19 =
  13. 13.270 − 59 =
  14. 14.508 − 88 =
  15. 15.109 − 59 =
  16. 16.414 − 18 =
  17. 17.581 − 37 =
  18. 18.226 − 59 =
  19. 19.160 − 77 =
  20. 20.388 − 76 =
  21. 21.106 − 26 =
  22. 22.157 − 56 =
  23. 23.248 − 47 =
  24. 24.482 − 16 =
  25. 25.538 − 29 =
  26. 26.351 − 18 =
  27. 27.239 − 48 =
  28. 28.477 − 96 =
  29. 29.447 − 47 =
  30. 30.226 − 68 =
  31. 31.377 − 46 =
  32. 32.538 − 66 =
  33. 33.596 − 59 =
  34. 34.199 − 46 =
  35. 35.394 − 27 =
  36. 36.514 − 76 =
  37. 37.499 − 56 =
  38. 38.276 − 36 =
  39. 39.177 − 28 =
  40. 40.185 − 76 =

Answer key

  1. 32
  2. 341
  3. 328
  4. 272
  5. 46
  6. 89
  7. 567
  8. 375
  9. 525
  10. 247
  11. 370
  12. 357
  13. 211
  14. 420
  15. 50
  16. 396
  17. 544
  18. 167
  19. 83
  20. 312
  21. 80
  22. 101
  23. 201
  24. 466
  25. 509
  26. 333
  27. 191
  28. 381
  29. 400
  30. 158
  31. 331
  32. 472
  33. 537
  34. 153
  35. 367
  36. 438
  37. 443
  38. 240
  39. 149
  40. 109

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