Answers

Subtract 98/63 from 81/80

1^st number: 1 1/80, 2^nd number: 1 35/63

81/80 - 98/63 is -391/720.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 63 is 5040
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5040
2. For the 1st fraction, since 80 × 63 = 5040,
   81/80 = 81 × 63/80 × 63 = 5103/5040
3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
   98/63 = 98 × 80/63 × 80 = 7840/5040
4. Subtract the two like fractions:
   5103/5040 - 7840/5040 = 5103 - 7840/5040 = -2737/5040
5. After reducing the fraction, the answer is -391/720

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