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Subtract 80/21 from 42/75

1st number: 42/75, 2nd number: 3 17/21

42/75 - 80/21 is -1706/525.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 21 is 525

    Next, find the equivalent fraction of both fractional numbers with denominator 525
  2. For the 1st fraction, since 75 × 7 = 525,
    42/75 = 42 × 7/75 × 7 = 294/525
  3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
    80/21 = 80 × 25/21 × 25 = 2000/525
  4. Subtract the two like fractions:
    294/525 - 2000/525 = 294 - 2000/525 = -1706/525

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