Subtract 84/63 from 8/30, Solve 8/30

Subtract 84/63 from 8/30

1^st number: 8/30, 2^nd number: 1 21/63

8/30 - 84/63 is -16/15.

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,
8/30 = 8 × 21/30 × 21 = 168/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
84/63 = 84 × 10/63 × 10 = 840/630
Subtract the two like fractions:
168/630 - 840/630 = 168 - 840/630 = -672/630
After reducing the fraction, the answer is -16/15

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