Subtract 20/84 from 30/27, Solve 1 3/27

Subtract 20/84 from 30/27

1^st number: 1 3/27, 2^nd number: 20/84

30/27 - 20/84 is 55/63.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 84 is 756

Next, find the equivalent fraction of both fractional numbers with denominator 756
For the 1st fraction, since 27 × 28 = 756,
30/27 = 30 × 28/27 × 28 = 840/756
Likewise, for the 2nd fraction, since 84 × 9 = 756,
20/84 = 20 × 9/84 × 9 = 180/756
Subtract the two like fractions:
840/756 - 180/756 = 840 - 180/756 = 660/756
After reducing the fraction, the answer is 55/63

MathStep (Works offline)

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