Add 5/42 and 12/9, Solve 5/42 + 1 3/9 as a fraction

Add 5/42 and 12/9

1^st number: 5/42, 2^nd number: 1 3/9

5/42 + 12/9 is 61/42.

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,
5/42 = 5 × 3/42 × 3 = 15/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
12/9 = 12 × 14/9 × 14 = 168/126
Add the two like fractions:
15/126 + 168/126 = 15 + 168/126 = 183/126
183/126 simplified gives 61/42
So, 5/42 + 12/9 = 61/42
In mixed form: 119/42

MathStep (Works offline)

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