Subtract 15/8 from 3/30, Solve 3/30

Subtract 15/8 from 3/30

1^st number: 3/30, 2^nd number: 1 7/8

3/30 - 15/8 is -71/40.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 8 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 30 × 4 = 120,
3/30 = 3 × 4/30 × 4 = 12/120
Likewise, for the 2nd fraction, since 8 × 15 = 120,
15/8 = 15 × 15/8 × 15 = 225/120
Subtract the two like fractions:
12/120 - 225/120 = 12 - 225/120 = -213/120
After reducing the fraction, the answer is -71/40

MathStep (Works offline)

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