Subtract 30/15 from 6/8, Solve 6/8 - 2 0/15 as a fraction

Subtract 30/15 from 6/8

1^st number: 6/8, 2^nd number: 2 0/15

6/8 - 30/15 is -5/4.

Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 8 × 15 = 120,
6/8 = 6 × 15/8 × 15 = 90/120
Likewise, for the 2nd fraction, since 15 × 8 = 120,
30/15 = 30 × 8/15 × 8 = 240/120
Subtract the two like fractions:
90/120 - 240/120 = 90 - 240/120 = -150/120
After reducing the fraction, the answer is -5/4

MathStep (Works offline)

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