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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 531 · 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. 1.569 − 77 =
  2. 2.57 − 17 =
  3. 3.296 − 38 =
  4. 4.239 − 97 =
  5. 5.350 − 68 =
  6. 6.181 − 27 =
  7. 7.536 − 38 =
  8. 8.586 − 77 =
  9. 9.172 − 28 =
  10. 10.207 − 87 =
  11. 11.233 − 36 =
  12. 12.231 − 77 =
  13. 13.185 − 79 =
  14. 14.295 − 87 =
  15. 15.335 − 39 =
  16. 16.223 − 77 =
  17. 17.562 − 88 =
  18. 18.519 − 19 =
  19. 19.293 − 26 =
  20. 20.478 − 39 =
  21. 21.531 − 87 =
  22. 22.499 − 98 =
  23. 23.541 − 86 =
  24. 24.269 − 96 =
  25. 25.403 − 19 =
  26. 26.388 − 46 =
  27. 27.421 − 89 =
  28. 28.460 − 16 =
  29. 29.194 − 49 =
  30. 30.229 − 68 =
  31. 31.158 − 97 =
  32. 32.96 − 19 =
  33. 33.199 − 17 =
  34. 34.234 − 29 =
  35. 35.575 − 36 =
  36. 36.102 − 78 =
  37. 37.336 − 88 =
  38. 38.159 − 88 =
  39. 39.219 − 88 =
  40. 40.556 − 47 =

Answer key

  1. 492
  2. 40
  3. 258
  4. 142
  5. 282
  6. 154
  7. 498
  8. 509
  9. 144
  10. 120
  11. 197
  12. 154
  13. 106
  14. 208
  15. 296
  16. 146
  17. 474
  18. 500
  19. 267
  20. 439
  21. 444
  22. 401
  23. 455
  24. 173
  25. 384
  26. 342
  27. 332
  28. 444
  29. 145
  30. 161
  31. 61
  32. 77
  33. 182
  34. 205
  35. 539
  36. 24
  37. 248
  38. 71
  39. 131
  40. 509

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