Add 90/21 and 2/90, Solve 4 6/21 + 2/90 as a fraction

Add 90/21 and 2/90

1^st number: 4 6/21, 2^nd number: 2/90

90/21 + 2/90 is 1357/315.

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

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 21 × 30 = 630,
90/21 = 90 × 30/21 × 30 = 2700/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
2/90 = 2 × 7/90 × 7 = 14/630
Add the two like fractions:
2700/630 + 14/630 = 2700 + 14/630 = 2714/630
2714/630 simplified gives 1357/315
So, 90/21 + 2/90 = 1357/315
In mixed form: 497/315

MathStep (Works offline)

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