Add 21/70 and 50/18, Solve 21/70 + 2 14/18 as a fraction

Add 21/70 and 50/18

1^st number: 21/70, 2^nd number: 2 14/18

21/70 + 50/18 is 277/90.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630
Likewise, for the 2nd fraction, since 18 × 35 = 630,
50/18 = 50 × 35/18 × 35 = 1750/630
Add the two like fractions:
189/630 + 1750/630 = 189 + 1750/630 = 1939/630
1939/630 simplified gives 277/90
So, 21/70 + 50/18 = 277/90
In mixed form: 37/90

MathStep (Works offline)

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