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Subtract 15/20 from 4/21

4/21 - 15/20 is -47/84.

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,
    4/21 = 4 × 20/21 × 20 = 80/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    15/20 = 15 × 21/20 × 21 = 315/420
  4. Subtract the two fractions:
    80/420 - 315/420 = 80 - 315/420 = -235/420
  5. After reducing the fraction, the answer is -47/84

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