Subtract 27/30 from 2/28, Solve 2/28

Subtract 27/30 from 2/28

2/28 - 27/30 is -29/35.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 28 × 15 = 420,
2/28 = 2 × 15/28 × 15 = 30/420
Likewise, for the 2nd fraction, since 30 × 14 = 420,
27/30 = 27 × 14/30 × 14 = 378/420
Subtract the two like fractions:
30/420 - 378/420 = 30 - 378/420 = -348/420
After reducing the fraction, the answer is -29/35

MathStep (Works offline)

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