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Subtract 84/63 from 8/21

1st number: 8/21, 2nd number: 1 21/63

8/21 - 84/63 is -20/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 63 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    8/21 = 8 × 3/21 × 3 = 24/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    84/63 = 84 × 1/63 × 1 = 84/63
  4. Subtract the two like fractions:
    24/63 - 84/63 = 24 - 84/63 = -60/63
  5. After reducing the fraction, the answer is -20/21

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