Answers

Subtract 98/81 from 9/21

1^st number: 9/21, 2^nd number: 1 17/81

9/21 - 98/81 is -443/567.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 81 is 567
   
   Next, find the equivalent fraction of both fractional numbers with denominator 567
2. For the 1st fraction, since 21 × 27 = 567,
   9/21 = 9 × 27/21 × 27 = 243/567
3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
   98/81 = 98 × 7/81 × 7 = 686/567
4. Subtract the two like fractions:
   243/567 - 686/567 = 243 - 686/567 = -443/567

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