Add 90/7 and 7/18, Solve 12 6/7 + 7/18 as a fraction

Add 90/7 and 7/18

1^st number: 12 6/7, 2^nd number: 7/18

90/7 + 7/18 is 1669/126.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 7 × 18 = 126,
90/7 = 90 × 18/7 × 18 = 1620/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
7/18 = 7 × 7/18 × 7 = 49/126
Add the two like fractions:
1620/126 + 49/126 = 1620 + 49/126 = 1669/126
So, 90/7 + 7/18 = 1669/126
In mixed form: 1331/126

MathStep (Works offline)

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