Answers

Subtract 81/80 from 1/7

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

1/7 - 81/80 is -487/560.

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,
   1/7 = 1 × 80/7 × 80 = 80/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   81/80 = 81 × 7/80 × 7 = 567/560
4. Subtract the two like fractions:
   80/560 - 567/560 = 80 - 567/560 = -487/560

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