Add 60/9 and 21/70, Solve 6 6/9 + 21/70 as a fraction

Add 60/9 and 21/70

1^st number: 6 6/9, 2^nd number: 21/70

60/9 + 21/70 is 209/30.

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

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 9 × 70 = 630,
60/9 = 60 × 70/9 × 70 = 4200/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630
Add the two like fractions:
4200/630 + 189/630 = 4200 + 189/630 = 4389/630
4389/630 simplified gives 209/30
So, 60/9 + 21/70 = 209/30
In mixed form: 629/30

MathStep (Works offline)

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