Add 63/21 and 90/54, Solve 3 0/21 + 1 36/54 as a fraction

Add 63/21 and 90/54

1^st number: 3 0/21, 2^nd number: 1 36/54

63/21 + 90/54 is 14/3.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 21 × 18 = 378,
63/21 = 63 × 18/21 × 18 = 1134/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
90/54 = 90 × 7/54 × 7 = 630/378
Add the two like fractions:
1134/378 + 630/378 = 1134 + 630/378 = 1764/378
1764/378 simplified gives 14/3
So, 63/21 + 90/54 = 14/3
In mixed form: 42/3

MathStep (Works offline)

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