Add 72/21 and 27/54
1st number: 3 9/21, 2nd number: 27/54
72/21 + 27/54 is 55/14.
Steps for adding fractions
- 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,
27/54 = 27 × 7/54 × 7 = 189/378 - Add the two like fractions:
1296/378 + 189/378 = 1296 + 189/378 = 1485/378 - 1485/378 simplified gives 55/14
- So, 72/21 + 27/54 = 55/14
In mixed form: 313/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+27/54 72/21+81/54 72/63+27/54