Answers

Subtract 25/8 from 63/81

1^st number: 63/81, 2^nd number: 3 1/8

63/81 - 25/8 is -169/72.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 8 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 81 × 8 = 648,
   63/81 = 63 × 8/81 × 8 = 504/648
3. Likewise, for the 2nd fraction, since 8 × 81 = 648,
   25/8 = 25 × 81/8 × 81 = 2025/648
4. Subtract the two like fractions:
   504/648 - 2025/648 = 504 - 2025/648 = -1521/648
5. After reducing the fraction, the answer is -169/72

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