Answers

Subtract 15/81 from 21/98

21/98 - 15/81 is 11/378.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 81 is 7938
   
   Next, find the equivalent fraction of both fractional numbers with denominator 7938
2. For the 1st fraction, since 98 × 81 = 7938,
   21/98 = 21 × 81/98 × 81 = 1701/7938
3. Likewise, for the 2nd fraction, since 81 × 98 = 7938,
   15/81 = 15 × 98/81 × 98 = 1470/7938
4. Subtract the two like fractions:
   1701/7938 - 1470/7938 = 1701 - 1470/7938 = 231/7938
5. After reducing the fraction, the answer is 11/378

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