Subtract 30/84 from 1/15, Solve 1/15

Subtract 30/84 from 1/15

1/15 - 30/84 is -61/210.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 15 × 28 = 420,
1/15 = 1 × 28/15 × 28 = 28/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
30/84 = 30 × 5/84 × 5 = 150/420
Subtract the two like fractions:
28/420 - 150/420 = 28 - 150/420 = -122/420
After reducing the fraction, the answer is -61/210

MathStep (Works offline)

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