Add 14/18 and 54/21, Solve 14/18 + 2 12/21 as a fraction

Add 14/18 and 54/21

1^st number: 14/18, 2^nd number: 2 12/21

14/18 + 54/21 is 211/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
14/18 = 14 × 7/18 × 7 = 98/126
Likewise, for the 2nd fraction, since 21 × 6 = 126,
54/21 = 54 × 6/21 × 6 = 324/126
Add the two like fractions:
98/126 + 324/126 = 98 + 324/126 = 422/126
422/126 simplified gives 211/63
So, 14/18 + 54/21 = 211/63
In mixed form: 322/63

MathStep (Works offline)

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