Answers

Subtract 25/21 from 63/90

1^st number: 63/90, 2^nd number: 1 4/21

63/90 - 25/21 is -103/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 21 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   63/90 = 63 × 7/90 × 7 = 441/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   25/21 = 25 × 30/21 × 30 = 750/630
4. Subtract the two like fractions:
   441/630 - 750/630 = 441 - 750/630 = -309/630
5. After reducing the fraction, the answer is -103/210

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