Add 4/21 and 90/10, Solve 4/21 + 9 0/10 as a fraction

Add 4/21 and 90/10

1^st number: 4/21, 2^nd number: 9 0/10

4/21 + 90/10 is 193/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
4/21 = 4 × 10/21 × 10 = 40/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
90/10 = 90 × 21/10 × 21 = 1890/210
Add the two like fractions:
40/210 + 1890/210 = 40 + 1890/210 = 1930/210
1930/210 simplified gives 193/21
So, 4/21 + 90/10 = 193/21
In mixed form: 94/21

MathStep (Works offline)

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