Subtract 21/63 from 4/30, Solve 4/30

Subtract 21/63 from 4/30

4/30 - 21/63 is -1/5.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 30 × 21 = 630,
4/30 = 4 × 21/30 × 21 = 84/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
21/63 = 21 × 10/63 × 10 = 210/630
Subtract the two like fractions:
84/630 - 210/630 = 84 - 210/630 = -126/630
After reducing the fraction, the answer is -1/5

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