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Subtract 25/20 from 12/21

1st number: 12/21, 2nd number: 1 5/20

12/21 - 25/20 is -19/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    12/21 = 12 × 20/21 × 20 = 240/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    25/20 = 25 × 21/20 × 21 = 525/420
  4. Subtract the two like fractions:
    240/420 - 525/420 = 240 - 525/420 = -285/420
  5. After reducing the fraction, the answer is -19/28

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