Add 18/70 and 28/9, Solve 18/70 + 3 1/9 as a fraction

Add 18/70 and 28/9

1^st number: 18/70, 2^nd number: 3 1/9

18/70 + 28/9 is 1061/315.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 9 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
18/70 = 18 × 9/70 × 9 = 162/630
Likewise, for the 2nd fraction, since 9 × 70 = 630,
28/9 = 28 × 70/9 × 70 = 1960/630
Add the two like fractions:
162/630 + 1960/630 = 162 + 1960/630 = 2122/630
2122/630 simplified gives 1061/315
So, 18/70 + 28/9 = 1061/315
In mixed form: 3116/315

MathStep (Works offline)

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