Add 27/70 and 80/63, Solve 27/70 + 1 17/63 as a fraction

Add 27/70 and 80/63

1^st number: 27/70, 2^nd number: 1 17/63

27/70 + 80/63 is 149/90.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 63 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
27/70 = 27 × 9/70 × 9 = 243/630
Likewise, for the 2nd fraction, since 63 × 10 = 630,
80/63 = 80 × 10/63 × 10 = 800/630
Add the two like fractions:
243/630 + 800/630 = 243 + 800/630 = 1043/630
1043/630 simplified gives 149/90
So, 27/70 + 80/63 = 149/90
In mixed form: 159/90

MathStep (Works offline)

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