Answers

Subtract 27/84 from 9/42

9/42 - 27/84 is -3/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 84 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 42 × 2 = 84,
   9/42 = 9 × 2/42 × 2 = 18/84
3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
   27/84 = 27 × 1/84 × 1 = 27/84
4. Subtract the two like fractions:
   18/84 - 27/84 = 18 - 27/84 = -9/84
5. After reducing the fraction, the answer is -3/28

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