Answers

Subtract 27/84 from 5/21

5/21 - 27/84 is -1/12.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 84 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   5/21 = 5 × 4/21 × 4 = 20/84
3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
   27/84 = 27 × 1/84 × 1 = 27/84
4. Subtract the two like fractions:
   20/84 - 27/84 = 20 - 27/84 = -7/84
5. After reducing the fraction, the answer is -1/12

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