Answers

Subtract 42/60 from 3/81

3/81 - 42/60 is -179/270.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 60 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   3/81 = 3 × 20/81 × 20 = 60/1620
3. Likewise, for the 2nd fraction, since 60 × 27 = 1620,
   42/60 = 42 × 27/60 × 27 = 1134/1620
4. Subtract the two like fractions:
   60/1620 - 1134/1620 = 60 - 1134/1620 = -1074/1620
5. After reducing the fraction, the answer is -179/270

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