Answers

Subtract 90/7 from 63/80

1^st number: 63/80, 2^nd number: 12 6/7

63/80 - 90/7 is -6759/560.

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,
   63/80 = 63 × 7/80 × 7 = 441/560
3. Likewise, for the 2nd fraction, since 7 × 80 = 560,
   90/7 = 90 × 80/7 × 80 = 7200/560
4. Subtract the two like fractions:
   441/560 - 7200/560 = 441 - 7200/560 = -6759/560

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