Add 15/12 and 15/10, Solve 1 3/12 + 1 5/10 as a fraction

Add 15/12 and 15/10

1^st number: 1 3/12, 2^nd number: 1 5/10

15/12 + 15/10 is 11/4.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 12 × 5 = 60,
15/12 = 15 × 5/12 × 5 = 75/60
Likewise, for the 2nd fraction, since 10 × 6 = 60,
15/10 = 15 × 6/10 × 6 = 90/60
Add the two like fractions:
75/60 + 90/60 = 75 + 90/60 = 165/60
165/60 simplified gives 11/4
So, 15/12 + 15/10 = 11/4
In mixed form: 23/4

MathStep (Works offline)

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