Answers

Subtract 20/54 from 2/21

2/21 - 20/54 is -52/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 21 × 18 = 378,
   2/21 = 2 × 18/21 × 18 = 36/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   20/54 = 20 × 7/54 × 7 = 140/378
4. Subtract the two like fractions:
   36/378 - 140/378 = 36 - 140/378 = -104/378
5. After reducing the fraction, the answer is -52/189

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