Add 27/21 and 90/5, Solve 1 6/21 + 18 0/5 as a fraction

Add 27/21 and 90/5

1^st number: 1 6/21, 2^nd number: 18 0/5

27/21 + 90/5 is 135/7.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
27/21 = 27 × 5/21 × 5 = 135/105
Likewise, for the 2nd fraction, since 5 × 21 = 105,
90/5 = 90 × 21/5 × 21 = 1890/105
Add the two like fractions:
135/105 + 1890/105 = 135 + 1890/105 = 2025/105
2025/105 simplified gives 135/7
So, 27/21 + 90/5 = 135/7
In mixed form: 192/7

MathStep (Works offline)

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