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Subtract 80/7 from 30/21

1st number: 1 9/21, 2nd number: 11 3/7

30/21 - 80/7 is -10/1.

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,
    30/21 = 30 × 1/21 × 1 = 30/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    80/7 = 80 × 3/7 × 3 = 240/21
  4. Subtract the two fractions:
    30/21 - 240/21 = 30 - 240/21 = -210/21
  5. After reducing the fraction, the answer is -10/1

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