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Subtract 40/7 from 80/18

1st number: 4 8/18, 2nd number: 5 5/7

80/18 - 40/7 is -80/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 7 is 126
  2. For the 1st fraction, since 18 × 7 = 126,
    80/18 = 80 × 7/18 × 7 = 560/126
  3. Likewise, for the 2nd fraction, since 7 × 18 = 126,
    40/7 = 40 × 18/7 × 18 = 720/126
  4. Subtract the two fractions:
    560/126 - 720/126 = 560 - 720/126 = -160/126
  5. After reducing the fraction, the answer is -80/63

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