Add 21/7 and 4/54, Solve 3 0/7 + 4/54 as a fraction

Add 21/7 and 4/54

1^st number: 3 0/7, 2^nd number: 4/54

21/7 + 4/54 is 83/27.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 7 × 54 = 378,
21/7 = 21 × 54/7 × 54 = 1134/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
4/54 = 4 × 7/54 × 7 = 28/378
Add the two like fractions:
1134/378 + 28/378 = 1134 + 28/378 = 1162/378
1162/378 simplified gives 83/27
So, 21/7 + 4/54 = 83/27
In mixed form: 32/27

MathStep (Works offline)

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