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Subtract 9/7 from 81/20

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

81/20 - 9/7 is 387/140.

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,
    81/20 = 81 × 7/20 × 7 = 567/140
  3. Likewise, for the 2nd fraction, since 7 × 20 = 140,
    9/7 = 9 × 20/7 × 20 = 180/140
  4. Subtract the two fractions:
    567/140 - 180/140 = 567 - 180/140 = 387/140
  5. In mixed form: 2107/140

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