Add 1/7 and 81/18, Solve 1/7 + 4 9/18 as a fraction

Add 1/7 and 81/18

1^st number: 1/7, 2^nd number: 4 9/18

1/7 + 81/18 is 65/14.

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,
1/7 = 1 × 18/7 × 18 = 18/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
81/18 = 81 × 7/18 × 7 = 567/126
Add the two like fractions:
18/126 + 567/126 = 18 + 567/126 = 585/126
585/126 simplified gives 65/14
So, 1/7 + 81/18 = 65/14
In mixed form: 49/14

MathStep (Works offline)

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