Answers

Subtract 75/21 from 21/54

1^st number: 21/54, 2^nd number: 3 12/21

21/54 - 75/21 is -401/126.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 21 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   21/54 = 21 × 7/54 × 7 = 147/378
3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
   75/21 = 75 × 18/21 × 18 = 1350/378
4. Subtract the two like fractions:
   147/378 - 1350/378 = 147 - 1350/378 = -1203/378
5. After reducing the fraction, the answer is -401/126

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