Add 15/42 and 6/9, Solve 15/42 + 6/9 as a fraction

Add 15/42 and 6/9

15/42 + 6/9 is 43/42.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
15/42 = 15 × 3/42 × 3 = 45/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
6/9 = 6 × 14/9 × 14 = 84/126
Add the two like fractions:
45/126 + 84/126 = 45 + 84/126 = 129/126
129/126 simplified gives 43/42
So, 15/42 + 6/9 = 43/42
In mixed form: 11/42

MathStep (Works offline)

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