Answers

Subtract 81/20 from 30/35

1^st number: 30/35, 2^nd number: 4 1/20

30/35 - 81/20 is -447/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 35 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 35 × 4 = 140,
   30/35 = 30 × 4/35 × 4 = 120/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   81/20 = 81 × 7/20 × 7 = 567/140
4. Subtract the two like fractions:
   120/140 - 567/140 = 120 - 567/140 = -447/140

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