Add 28/21 and 8/70, Solve 1 7/21 + 8/70 as a fraction

Add 28/21 and 8/70

1^st number: 1 7/21, 2^nd number: 8/70

28/21 + 8/70 is 152/105.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210
Likewise, for the 2nd fraction, since 70 × 3 = 210,
8/70 = 8 × 3/70 × 3 = 24/210
Add the two like fractions:
280/210 + 24/210 = 280 + 24/210 = 304/210
304/210 simplified gives 152/105
So, 28/21 + 8/70 = 152/105
In mixed form: 147/105

MathStep (Works offline)

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