Subtract 90/80 from 1/63, Solve 1/63

Subtract 90/80 from 1/63

1^st number: 1/63, 2^nd number: 1 10/80

1/63 - 90/80 is -559/504.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 80 is 5040

Next, find the equivalent fraction of both fractional numbers with denominator 5040
For the 1st fraction, since 63 × 80 = 5040,
1/63 = 1 × 80/63 × 80 = 80/5040
Likewise, for the 2nd fraction, since 80 × 63 = 5040,
90/80 = 90 × 63/80 × 63 = 5670/5040
Subtract the two like fractions:
80/5040 - 5670/5040 = 80 - 5670/5040 = -5590/5040
After reducing the fraction, the answer is -559/504

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