Subtract 30/70 from 3/63, Solve 3/63

Subtract 30/70 from 3/63

3/63 - 30/70 is -8/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 70 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 63 × 10 = 630,
3/63 = 3 × 10/63 × 10 = 30/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
30/70 = 30 × 9/70 × 9 = 270/630
Subtract the two like fractions:
30/630 - 270/630 = 30 - 270/630 = -240/630
After reducing the fraction, the answer is -8/21

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