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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 427 · 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. 1.284 − 66 =
  2. 2.504 − 48 =
  3. 3.295 − 67 =
  4. 4.253 − 49 =
  5. 5.531 − 68 =
  6. 6.192 − 97 =
  7. 7.589 − 57 =
  8. 8.592 − 56 =
  9. 9.88 − 67 =
  10. 10.476 − 69 =
  11. 11.531 − 59 =
  12. 12.579 − 97 =
  13. 13.314 − 77 =
  14. 14.260 − 78 =
  15. 15.430 − 98 =
  16. 16.387 − 26 =
  17. 17.169 − 37 =
  18. 18.94 − 57 =
  19. 19.591 − 46 =
  20. 20.300 − 59 =
  21. 21.195 − 17 =
  22. 22.578 − 57 =
  23. 23.463 − 18 =
  24. 24.167 − 67 =
  25. 25.361 − 57 =
  26. 26.154 − 99 =
  27. 27.145 − 66 =
  28. 28.365 − 78 =
  29. 29.63 − 26 =
  30. 30.578 − 89 =
  31. 31.304 − 28 =
  32. 32.81 − 16 =
  33. 33.247 − 16 =
  34. 34.231 − 67 =
  35. 35.401 − 57 =
  36. 36.82 − 49 =
  37. 37.271 − 89 =
  38. 38.126 − 39 =
  39. 39.580 − 19 =
  40. 40.209 − 49 =

Answer key

  1. 218
  2. 456
  3. 228
  4. 204
  5. 463
  6. 95
  7. 532
  8. 536
  9. 21
  10. 407
  11. 472
  12. 482
  13. 237
  14. 182
  15. 332
  16. 361
  17. 132
  18. 37
  19. 545
  20. 241
  21. 178
  22. 521
  23. 445
  24. 100
  25. 304
  26. 55
  27. 79
  28. 287
  29. 37
  30. 489
  31. 276
  32. 65
  33. 231
  34. 164
  35. 344
  36. 33
  37. 182
  38. 87
  39. 561
  40. 160

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