Subtract 18/27 from 27/30, Solve 27/30

Subtract 18/27 from 27/30

27/30 - 18/27 is 7/30.

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,
18/27 = 18 × 10/27 × 10 = 180/270
Subtract the two like fractions:
243/270 - 180/270 = 243 - 180/270 = 63/270
After reducing the fraction, the answer is 7/30

MathStep (Works offline)

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