Answers

Subtract 6/81 from 3/42

3/42 - 6/81 is -1/378.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 81 is 1134
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1134
2. For the 1st fraction, since 42 × 27 = 1134,
   3/42 = 3 × 27/42 × 27 = 81/1134
3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
   6/81 = 6 × 14/81 × 14 = 84/1134
4. Subtract the two like fractions:
   81/1134 - 84/1134 = 81 - 84/1134 = -3/1134
5. After reducing the fraction, the answer is -1/378

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