Answers

Subtract 81/7 from 18/5

1^st number: 3 3/5, 2^nd number: 11 4/7

18/5 - 81/7 is -279/35.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 7 is 35
   
   Next, find the equivalent fraction of both fractional numbers with denominator 35
2. For the 1st fraction, since 5 × 7 = 35,
   18/5 = 18 × 7/5 × 7 = 126/35
3. Likewise, for the 2nd fraction, since 7 × 5 = 35,
   81/7 = 81 × 5/7 × 5 = 405/35
4. Subtract the two like fractions:
   126/35 - 405/35 = 126 - 405/35 = -279/35

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