Subtract 6/90 from 20/63, Solve 20/63

Subtract 6/90 from 20/63

20/63 - 6/90 is 79/315.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 63 × 10 = 630,
20/63 = 20 × 10/63 × 10 = 200/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
6/90 = 6 × 7/90 × 7 = 42/630
Subtract the two like fractions:
200/630 - 42/630 = 200 - 42/630 = 158/630
After reducing the fraction, the answer is 79/315

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