Subtract 72/27 from 27/30, Solve 27/30

Subtract 72/27 from 27/30

1^st number: 27/30, 2^nd number: 2 18/27

27/30 - 72/27 is -53/30.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 27 is 270

Next, find the equivalent fraction of both fractional numbers with denominator 270
For the 1st fraction, since 30 × 9 = 270,
27/30 = 27 × 9/30 × 9 = 243/270
Likewise, for the 2nd fraction, since 27 × 10 = 270,
72/27 = 72 × 10/27 × 10 = 720/270
Subtract the two like fractions:
243/270 - 720/270 = 243 - 720/270 = -477/270
After reducing the fraction, the answer is -53/30

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad