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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 983 · 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. 1.584 − 19 =
  2. 2.444 − 86 =
  3. 3.353 − 19 =
  4. 4.525 − 77 =
  5. 5.529 − 79 =
  6. 6.325 − 17 =
  7. 7.317 − 97 =
  8. 8.331 − 56 =
  9. 9.336 − 16 =
  10. 10.258 − 49 =
  11. 11.213 − 28 =
  12. 12.596 − 88 =
  13. 13.522 − 67 =
  14. 14.182 − 89 =
  15. 15.532 − 47 =
  16. 16.256 − 86 =
  17. 17.328 − 16 =
  18. 18.89 − 66 =
  19. 19.302 − 96 =
  20. 20.552 − 26 =
  21. 21.398 − 58 =
  22. 22.512 − 18 =
  23. 23.225 − 96 =
  24. 24.387 − 28 =
  25. 25.180 − 49 =
  26. 26.167 − 79 =
  27. 27.357 − 97 =
  28. 28.342 − 57 =
  29. 29.413 − 46 =
  30. 30.138 − 86 =
  31. 31.182 − 69 =
  32. 32.207 − 16 =
  33. 33.123 − 17 =
  34. 34.357 − 97 =
  35. 35.203 − 58 =
  36. 36.96 − 57 =
  37. 37.296 − 37 =
  38. 38.183 − 87 =
  39. 39.563 − 96 =
  40. 40.96 − 78 =

Answer key

  1. 565
  2. 358
  3. 334
  4. 448
  5. 450
  6. 308
  7. 220
  8. 275
  9. 320
  10. 209
  11. 185
  12. 508
  13. 455
  14. 93
  15. 485
  16. 170
  17. 312
  18. 23
  19. 206
  20. 526
  21. 340
  22. 494
  23. 129
  24. 359
  25. 131
  26. 88
  27. 260
  28. 285
  29. 367
  30. 52
  31. 113
  32. 191
  33. 106
  34. 260
  35. 145
  36. 39
  37. 259
  38. 96
  39. 467
  40. 18

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