Answers

Subtract 42/80 from 98/81

1^st number: 1 17/81, 2^nd number: 42/80

98/81 - 42/80 is 2219/3240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 80 is 6480
   
   Next, find the equivalent fraction of both fractional numbers with denominator 6480
2. For the 1st fraction, since 81 × 80 = 6480,
   98/81 = 98 × 80/81 × 80 = 7840/6480
3. Likewise, for the 2nd fraction, since 80 × 81 = 6480,
   42/80 = 42 × 81/80 × 81 = 3402/6480
4. Subtract the two like fractions:
   7840/6480 - 3402/6480 = 7840 - 3402/6480 = 4438/6480
5. After reducing the fraction, the answer is 2219/3240

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