Subtract 2/72 from 30/8, Solve 3 6/8

Subtract 2/72 from 30/8

1^st number: 3 6/8, 2^nd number: 2/72

30/8 - 2/72 is 67/18.

Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 8 × 9 = 72,
30/8 = 30 × 9/8 × 9 = 270/72
Likewise, for the 2nd fraction, since 72 × 1 = 72,
2/72 = 2 × 1/72 × 1 = 2/72
Subtract the two like fractions:
270/72 - 2/72 = 270 - 2/72 = 268/72
After reducing the fraction, the answer is 67/18
In mixed form: 313/18

MathStep (Works offline)

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