Add 20/12 and 6/45, Solve 1 8/12 + 6/45 as a fraction

Add 20/12 and 6/45

1^st number: 1 8/12, 2^nd number: 6/45

20/12 + 6/45 is 9/5.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 12 × 15 = 180,
20/12 = 20 × 15/12 × 15 = 300/180
Likewise, for the 2nd fraction, since 45 × 4 = 180,
6/45 = 6 × 4/45 × 4 = 24/180
Add the two like fractions:
300/180 + 24/180 = 300 + 24/180 = 324/180
324/180 simplified gives 9/5
So, 20/12 + 6/45 = 9/5
In mixed form: 14/5

MathStep (Works offline)

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