Subtract 72/63 from 4/30, Solve 4/30

Subtract 72/63 from 4/30

1^st number: 4/30, 2^nd number: 1 9/63

4/30 - 72/63 is -106/105.

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,
72/63 = 72 × 10/63 × 10 = 720/630
Subtract the two like fractions:
84/630 - 720/630 = 84 - 720/630 = -636/630
After reducing the fraction, the answer is -106/105

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