Answers

Subtract 81/80 from 5/7

1^st number: 5/7, 2^nd number: 1 1/80

5/7 - 81/80 is -167/560.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 7 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 7 × 80 = 560,
   5/7 = 5 × 80/7 × 80 = 400/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   81/80 = 81 × 7/80 × 7 = 567/560
4. Subtract the two like fractions:
   400/560 - 567/560 = 400 - 567/560 = -167/560

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