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Subtract 5/7 from 12/21

12/21 - 5/7 is -1/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21

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

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