Answers

Subtract 20/63 from 30/54

30/54 - 20/63 is 5/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 63 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   30/54 = 30 × 7/54 × 7 = 210/378
3. Likewise, for the 2nd fraction, since 63 × 6 = 378,
   20/63 = 20 × 6/63 × 6 = 120/378
4. Subtract the two like fractions:
   210/378 - 120/378 = 210 - 120/378 = 90/378
5. After reducing the fraction, the answer is 5/21

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