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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 888 · 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. 1.424 − 39 =
  2. 2.210 − 76 =
  3. 3.116 − 96 =
  4. 4.590 − 26 =
  5. 5.158 − 47 =
  6. 6.432 − 96 =
  7. 7.290 − 49 =
  8. 8.393 − 18 =
  9. 9.319 − 87 =
  10. 10.180 − 98 =
  11. 11.514 − 46 =
  12. 12.56 − 18 =
  13. 13.523 − 77 =
  14. 14.329 − 18 =
  15. 15.316 − 36 =
  16. 16.278 − 86 =
  17. 17.65 − 46 =
  18. 18.580 − 88 =
  19. 19.345 − 79 =
  20. 20.386 − 88 =
  21. 21.240 − 19 =
  22. 22.110 − 29 =
  23. 23.330 − 78 =
  24. 24.234 − 17 =
  25. 25.163 − 58 =
  26. 26.353 − 59 =
  27. 27.134 − 48 =
  28. 28.153 − 76 =
  29. 29.391 − 68 =
  30. 30.79 − 46 =
  31. 31.515 − 26 =
  32. 32.498 − 48 =
  33. 33.190 − 76 =
  34. 34.202 − 36 =
  35. 35.553 − 47 =
  36. 36.199 − 28 =
  37. 37.397 − 16 =
  38. 38.170 − 78 =
  39. 39.263 − 28 =
  40. 40.527 − 17 =

Answer key

  1. 385
  2. 134
  3. 20
  4. 564
  5. 111
  6. 336
  7. 241
  8. 375
  9. 232
  10. 82
  11. 468
  12. 38
  13. 446
  14. 311
  15. 280
  16. 192
  17. 19
  18. 492
  19. 266
  20. 298
  21. 221
  22. 81
  23. 252
  24. 217
  25. 105
  26. 294
  27. 86
  28. 77
  29. 323
  30. 33
  31. 489
  32. 450
  33. 114
  34. 166
  35. 506
  36. 171
  37. 381
  38. 92
  39. 235
  40. 510

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