Answers

Subtract 25/21 from 18/63

1^st number: 18/63, 2^nd number: 1 4/21

18/63 - 25/21 is -19/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 21 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 63 × 1 = 63,
   18/63 = 18 × 1/63 × 1 = 18/63
3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
   25/21 = 25 × 3/21 × 3 = 75/63
4. Subtract the two like fractions:
   18/63 - 75/63 = 18 - 75/63 = -57/63
5. After reducing the fraction, the answer is -19/21

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