Add 28/56 and 70/9, Solve 28/56 + 7 7/9 as a fraction

Add 28/56 and 70/9

1^st number: 28/56, 2^nd number: 7 7/9

28/56 + 70/9 is 149/18.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 9 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 56 × 9 = 504,
28/56 = 28 × 9/56 × 9 = 252/504
Likewise, for the 2nd fraction, since 9 × 56 = 504,
70/9 = 70 × 56/9 × 56 = 3920/504
Add the two like fractions:
252/504 + 3920/504 = 252 + 3920/504 = 4172/504
4172/504 simplified gives 149/18
So, 28/56 + 70/9 = 149/18
In mixed form: 85/18

MathStep (Works offline)

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