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Subtract 5/12 from 20/21

20/21 - 5/12 is 15/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    20/21 = 20 × 4/21 × 4 = 80/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    5/12 = 5 × 7/12 × 7 = 35/84
  4. Subtract the two like fractions:
    80/84 - 35/84 = 80 - 35/84 = 45/84
  5. After reducing the fraction, the answer is 15/28

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