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Subtract 2/20 from 3/21

3/21 - 2/20 is 3/70.

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,
    3/21 = 3 × 20/21 × 20 = 60/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    2/20 = 2 × 21/20 × 21 = 42/420
  4. Subtract the two like fractions:
    60/420 - 42/420 = 60 - 42/420 = 18/420
  5. After reducing the fraction, the answer is 3/70

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