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Subtract 3/20 from 8/21

8/21 - 3/20 is 97/420.

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,
    8/21 = 8 × 20/21 × 20 = 160/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    3/20 = 3 × 21/20 × 21 = 63/420
  4. Subtract the two like fractions:
    160/420 - 63/420 = 160 - 63/420 = 97/420

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