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Subtract 1/20 from 2/21

2/21 - 1/20 is 19/420.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    2/21 = 2 × 20/21 × 20 = 40/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    1/20 = 1 × 21/20 × 21 = 21/420
  4. Subtract the two fractions:
    40/420 - 21/420 = 40 - 21/420 = 19/420

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