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Subtract 18/7 from 27/20

1st number: 1 7/20, 2nd number: 2 4/7

27/20 - 18/7 is -171/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 7 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    27/20 = 27 × 7/20 × 7 = 189/140
  3. Likewise, for the 2nd fraction, since 7 × 20 = 140,
    18/7 = 18 × 20/7 × 20 = 360/140
  4. Subtract the two fractions:
    189/140 - 360/140 = 189 - 360/140 = -171/140

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