Subtract 70/63 from 27/30, Solve 27/30

Subtract 70/63 from 27/30

1^st number: 27/30, 2^nd number: 1 7/63

27/30 - 70/63 is -19/90.

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,
27/30 = 27 × 21/30 × 21 = 567/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
70/63 = 70 × 10/63 × 10 = 700/630
Subtract the two like fractions:
567/630 - 700/630 = 567 - 700/630 = -133/630
After reducing the fraction, the answer is -19/90

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