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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 810 · 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. 1.92 − 39 =
  2. 2.197 − 38 =
  3. 3.91 − 17 =
  4. 4.129 − 66 =
  5. 5.131 − 29 =
  6. 6.127 − 39 =
  7. 7.498 − 36 =
  8. 8.349 − 16 =
  9. 9.174 − 96 =
  10. 10.486 − 77 =
  11. 11.457 − 17 =
  12. 12.589 − 38 =
  13. 13.455 − 87 =
  14. 14.330 − 26 =
  15. 15.236 − 69 =
  16. 16.416 − 77 =
  17. 17.344 − 59 =
  18. 18.284 − 16 =
  19. 19.121 − 49 =
  20. 20.96 − 47 =
  21. 21.261 − 16 =
  22. 22.192 − 97 =
  23. 23.342 − 19 =
  24. 24.224 − 36 =
  25. 25.157 − 98 =
  26. 26.173 − 16 =
  27. 27.507 − 19 =
  28. 28.89 − 69 =
  29. 29.542 − 39 =
  30. 30.238 − 17 =
  31. 31.96 − 86 =
  32. 32.216 − 96 =
  33. 33.186 − 47 =
  34. 34.255 − 78 =
  35. 35.140 − 78 =
  36. 36.204 − 96 =
  37. 37.452 − 18 =
  38. 38.306 − 47 =
  39. 39.303 − 88 =
  40. 40.507 − 16 =

Answer key

  1. 53
  2. 159
  3. 74
  4. 63
  5. 102
  6. 88
  7. 462
  8. 333
  9. 78
  10. 409
  11. 440
  12. 551
  13. 368
  14. 304
  15. 167
  16. 339
  17. 285
  18. 268
  19. 72
  20. 49
  21. 245
  22. 95
  23. 323
  24. 188
  25. 59
  26. 157
  27. 488
  28. 20
  29. 503
  30. 221
  31. 10
  32. 120
  33. 139
  34. 177
  35. 62
  36. 108
  37. 434
  38. 259
  39. 215
  40. 491

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