Add 72/21 and 32/54, Solve 3 9/21 + 32/54 as a fraction

Add 72/21 and 32/54

1^st number: 3 9/21, 2^nd number: 32/54

72/21 + 32/54 is 760/189.

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,
72/21 = 72 × 18/21 × 18 = 1296/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
32/54 = 32 × 7/54 × 7 = 224/378
Add the two like fractions:
1296/378 + 224/378 = 1296 + 224/378 = 1520/378
1520/378 simplified gives 760/189
So, 72/21 + 32/54 = 760/189
In mixed form: 44/189

MathStep (Works offline)

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