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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 987 · 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. 1.558 − 87 =
  2. 2.234 − 86 =
  3. 3.52 − 36 =
  4. 4.202 − 66 =
  5. 5.320 − 38 =
  6. 6.125 − 17 =
  7. 7.269 − 57 =
  8. 8.90 − 17 =
  9. 9.284 − 66 =
  10. 10.413 − 36 =
  11. 11.113 − 68 =
  12. 12.306 − 36 =
  13. 13.153 − 78 =
  14. 14.584 − 46 =
  15. 15.356 − 97 =
  16. 16.121 − 49 =
  17. 17.390 − 99 =
  18. 18.355 − 79 =
  19. 19.409 − 76 =
  20. 20.554 − 37 =
  21. 21.94 − 58 =
  22. 22.274 − 78 =
  23. 23.331 − 57 =
  24. 24.217 − 18 =
  25. 25.166 − 56 =
  26. 26.174 − 16 =
  27. 27.83 − 78 =
  28. 28.212 − 98 =
  29. 29.566 − 97 =
  30. 30.593 − 19 =
  31. 31.116 − 29 =
  32. 32.485 − 47 =
  33. 33.339 − 76 =
  34. 34.227 − 19 =
  35. 35.79 − 46 =
  36. 36.584 − 28 =
  37. 37.391 − 17 =
  38. 38.229 − 17 =
  39. 39.372 − 16 =
  40. 40.172 − 56 =

Answer key

  1. 471
  2. 148
  3. 16
  4. 136
  5. 282
  6. 108
  7. 212
  8. 73
  9. 218
  10. 377
  11. 45
  12. 270
  13. 75
  14. 538
  15. 259
  16. 72
  17. 291
  18. 276
  19. 333
  20. 517
  21. 36
  22. 196
  23. 274
  24. 199
  25. 110
  26. 158
  27. 5
  28. 114
  29. 469
  30. 574
  31. 87
  32. 438
  33. 263
  34. 208
  35. 33
  36. 556
  37. 374
  38. 212
  39. 356
  40. 116

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