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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 529 · 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. 1.563 − 48 =
  2. 2.379 − 26 =
  3. 3.170 − 68 =
  4. 4.77 − 57 =
  5. 5.453 − 87 =
  6. 6.432 − 67 =
  7. 7.82 − 39 =
  8. 8.593 − 77 =
  9. 9.66 − 46 =
  10. 10.487 − 76 =
  11. 11.474 − 17 =
  12. 12.105 − 58 =
  13. 13.172 − 59 =
  14. 14.188 − 76 =
  15. 15.213 − 78 =
  16. 16.227 − 89 =
  17. 17.339 − 69 =
  18. 18.165 − 79 =
  19. 19.545 − 68 =
  20. 20.83 − 46 =
  21. 21.567 − 76 =
  22. 22.83 − 48 =
  23. 23.496 − 88 =
  24. 24.344 − 87 =
  25. 25.152 − 88 =
  26. 26.389 − 96 =
  27. 27.130 − 79 =
  28. 28.546 − 56 =
  29. 29.298 − 27 =
  30. 30.78 − 56 =
  31. 31.363 − 99 =
  32. 32.145 − 26 =
  33. 33.266 − 26 =
  34. 34.223 − 97 =
  35. 35.184 − 76 =
  36. 36.495 − 49 =
  37. 37.385 − 76 =
  38. 38.174 − 66 =
  39. 39.463 − 18 =
  40. 40.96 − 28 =

Answer key

  1. 515
  2. 353
  3. 102
  4. 20
  5. 366
  6. 365
  7. 43
  8. 516
  9. 20
  10. 411
  11. 457
  12. 47
  13. 113
  14. 112
  15. 135
  16. 138
  17. 270
  18. 86
  19. 477
  20. 37
  21. 491
  22. 35
  23. 408
  24. 257
  25. 64
  26. 293
  27. 51
  28. 490
  29. 271
  30. 22
  31. 264
  32. 119
  33. 240
  34. 126
  35. 108
  36. 446
  37. 309
  38. 108
  39. 445
  40. 68

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