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Subtract 7/9 from 81/80

1st number: 1 1/80, 2nd number: 7/9

81/80 - 7/9 is 169/720.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 9 is 720
  2. For the 1st fraction, since 80 × 9 = 720,
    81/80 = 81 × 9/80 × 9 = 729/720
  3. Likewise, for the 2nd fraction, since 9 × 80 = 720,
    7/9 = 7 × 80/9 × 80 = 560/720
  4. Subtract the two fractions:
    729/720 - 560/720 = 729 - 560/720 = 169/720

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