Subtract 90/63 from 30/36, Solve 30/36

Subtract 90/63 from 30/36

1^st number: 30/36, 2^nd number: 1 27/63

30/36 - 90/63 is -25/42.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 63 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 36 × 7 = 252,
30/36 = 30 × 7/36 × 7 = 210/252
Likewise, for the 2nd fraction, since 63 × 4 = 252,
90/63 = 90 × 4/63 × 4 = 360/252
Subtract the two like fractions:
210/252 - 360/252 = 210 - 360/252 = -150/252
After reducing the fraction, the answer is -25/42

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