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Subtract 80/21 from 10/9

1st number: 1 1/9, 2nd number: 3 17/21

10/9 - 80/21 is -170/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 21 is 63
  2. For the 1st fraction, since 9 × 7 = 63,
    10/9 = 10 × 7/9 × 7 = 70/63
  3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
    80/21 = 80 × 3/21 × 3 = 240/63
  4. Subtract the two fractions:
    70/63 - 240/63 = 70 - 240/63 = -170/63

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