Subtract 12/9 from 80/30, Solve 2 20/30

Subtract 12/9 from 80/30

1^st number: 2 20/30, 2^nd number: 1 3/9

80/30 - 12/9 is 4/3.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90

Next, find the equivalent fraction of both fractional numbers with denominator 90
For the 1st fraction, since 30 × 3 = 90,
80/30 = 80 × 3/30 × 3 = 240/90
Likewise, for the 2nd fraction, since 9 × 10 = 90,
12/9 = 12 × 10/9 × 10 = 120/90
Subtract the two like fractions:
240/90 - 120/90 = 240 - 120/90 = 120/90
After reducing the fraction, the answer is 4/3
In mixed form: 11/3

MathStep (Works offline)

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