Subtract 90/54 from 30/63, Solve 30/63

Subtract 90/54 from 30/63

1^st number: 30/63, 2^nd number: 1 36/54

30/63 - 90/54 is -25/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 63 × 6 = 378,
30/63 = 30 × 6/63 × 6 = 180/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378
Subtract the two like fractions:
180/378 - 630/378 = 180 - 630/378 = -450/378
After reducing the fraction, the answer is -25/21

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