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Subtract 9/7 from 18/80

1st number: 18/80, 2nd number: 1 2/7

18/80 - 9/7 is -297/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 7 is 560
  2. For the 1st fraction, since 80 × 7 = 560,
    18/80 = 18 × 7/80 × 7 = 126/560
  3. Likewise, for the 2nd fraction, since 7 × 80 = 560,
    9/7 = 9 × 80/7 × 80 = 720/560
  4. Subtract the two fractions:
    126/560 - 720/560 = 126 - 720/560 = -594/560
  5. After reducing the fraction, the answer is -297/280

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