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Subtract 8/7 from 8/21

1st number: 8/21, 2nd number: 1 1/7

8/21 - 8/7 is -16/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21
  2. For the 1st fraction, since 21 × 1 = 21,
    8/21 = 8 × 1/21 × 1 = 8/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    8/7 = 8 × 3/7 × 3 = 24/21
  4. Subtract the two fractions:
    8/21 - 24/21 = 8 - 24/21 = -16/21

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