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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 909 · 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. 1.161 − 79 =
  2. 2.346 − 38 =
  3. 3.456 − 27 =
  4. 4.570 − 27 =
  5. 5.162 − 79 =
  6. 6.596 − 79 =
  7. 7.466 − 56 =
  8. 8.334 − 88 =
  9. 9.98 − 17 =
  10. 10.503 − 49 =
  11. 11.205 − 99 =
  12. 12.134 − 28 =
  13. 13.591 − 96 =
  14. 14.426 − 37 =
  15. 15.589 − 46 =
  16. 16.427 − 77 =
  17. 17.180 − 49 =
  18. 18.575 − 37 =
  19. 19.542 − 49 =
  20. 20.372 − 37 =
  21. 21.375 − 76 =
  22. 22.171 − 78 =
  23. 23.129 − 29 =
  24. 24.73 − 56 =
  25. 25.371 − 66 =
  26. 26.511 − 26 =
  27. 27.149 − 68 =
  28. 28.101 − 46 =
  29. 29.551 − 66 =
  30. 30.318 − 27 =
  31. 31.580 − 87 =
  32. 32.266 − 98 =
  33. 33.189 − 69 =
  34. 34.379 − 47 =
  35. 35.121 − 96 =
  36. 36.557 − 98 =
  37. 37.280 − 96 =
  38. 38.379 − 97 =
  39. 39.361 − 47 =
  40. 40.483 − 89 =

Answer key

  1. 82
  2. 308
  3. 429
  4. 543
  5. 83
  6. 517
  7. 410
  8. 246
  9. 81
  10. 454
  11. 106
  12. 106
  13. 495
  14. 389
  15. 543
  16. 350
  17. 131
  18. 538
  19. 493
  20. 335
  21. 299
  22. 93
  23. 100
  24. 17
  25. 305
  26. 485
  27. 81
  28. 55
  29. 485
  30. 291
  31. 493
  32. 168
  33. 120
  34. 332
  35. 25
  36. 459
  37. 184
  38. 282
  39. 314
  40. 394

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