Add 5/90 and 45/21, Solve 5/90 + 2 3/21 as a fraction

Add 5/90 and 45/21

1^st number: 5/90, 2^nd number: 2 3/21

5/90 + 45/21 is 277/126.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
5/90 = 5 × 7/90 × 7 = 35/630
Likewise, for the 2nd fraction, since 21 × 30 = 630,
45/21 = 45 × 30/21 × 30 = 1350/630
Add the two like fractions:
35/630 + 1350/630 = 35 + 1350/630 = 1385/630
1385/630 simplified gives 277/126
So, 5/90 + 45/21 = 277/126
In mixed form: 225/126

MathStep (Works offline)

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