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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 447 · 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. 1.256 − 27 =
  2. 2.100 − 87 =
  3. 3.299 − 37 =
  4. 4.310 − 79 =
  5. 5.73 − 66 =
  6. 6.321 − 58 =
  7. 7.153 − 77 =
  8. 8.587 − 56 =
  9. 9.474 − 28 =
  10. 10.76 − 49 =
  11. 11.226 − 68 =
  12. 12.178 − 97 =
  13. 13.243 − 57 =
  14. 14.263 − 27 =
  15. 15.248 − 67 =
  16. 16.436 − 57 =
  17. 17.107 − 78 =
  18. 18.67 − 28 =
  19. 19.367 − 59 =
  20. 20.142 − 39 =
  21. 21.398 − 57 =
  22. 22.99 − 69 =
  23. 23.121 − 26 =
  24. 24.146 − 37 =
  25. 25.295 − 56 =
  26. 26.166 − 46 =
  27. 27.269 − 26 =
  28. 28.300 − 68 =
  29. 29.562 − 38 =
  30. 30.250 − 59 =
  31. 31.423 − 28 =
  32. 32.560 − 29 =
  33. 33.260 − 36 =
  34. 34.204 − 28 =
  35. 35.484 − 68 =
  36. 36.164 − 77 =
  37. 37.404 − 19 =
  38. 38.547 − 77 =
  39. 39.55 − 37 =
  40. 40.81 − 27 =

Answer key

  1. 229
  2. 13
  3. 262
  4. 231
  5. 7
  6. 263
  7. 76
  8. 531
  9. 446
  10. 27
  11. 158
  12. 81
  13. 186
  14. 236
  15. 181
  16. 379
  17. 29
  18. 39
  19. 308
  20. 103
  21. 341
  22. 30
  23. 95
  24. 109
  25. 239
  26. 120
  27. 243
  28. 232
  29. 524
  30. 191
  31. 395
  32. 531
  33. 224
  34. 176
  35. 416
  36. 87
  37. 385
  38. 470
  39. 18
  40. 54

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