Answers

Subtract 35/20 from 12/81

1^st number: 12/81, 2^nd number: 1 15/20

12/81 - 35/20 is -173/108.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 20 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   12/81 = 12 × 20/81 × 20 = 240/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   35/20 = 35 × 81/20 × 81 = 2835/1620
4. Subtract the two like fractions:
   240/1620 - 2835/1620 = 240 - 2835/1620 = -2595/1620
5. After reducing the fraction, the answer is -173/108

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