Answers

Subtract 63/7 from 90/80

1^st number: 1 10/80, 2^nd number: 9 0/7

90/80 - 63/7 is -63/8.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 7 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   90/80 = 90 × 7/80 × 7 = 630/560
3. Likewise, for the 2nd fraction, since 7 × 80 = 560,
   63/7 = 63 × 80/7 × 80 = 5040/560
4. Subtract the two like fractions:
   630/560 - 5040/560 = 630 - 5040/560 = -4410/560
5. After reducing the fraction, the answer is -63/8

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