Subtract 20/54 from 15/9, Solve 1 6/9

Subtract 20/54 from 15/9

1^st number: 1 6/9, 2^nd number: 20/54

15/9 - 20/54 is 35/27.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 54 is 54

Next, find the equivalent fraction of both fractional numbers with denominator 54
For the 1st fraction, since 9 × 6 = 54,
15/9 = 15 × 6/9 × 6 = 90/54
Likewise, for the 2nd fraction, since 54 × 1 = 54,
20/54 = 20 × 1/54 × 1 = 20/54
Subtract the two like fractions:
90/54 - 20/54 = 90 - 20/54 = 70/54
After reducing the fraction, the answer is 35/27
In mixed form: 18/27

MathStep (Works offline)

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