Add 14/60 and 72/21, Solve 14/60 + 3 9/21 as a fraction

Add 14/60 and 72/21

1^st number: 14/60, 2^nd number: 3 9/21

14/60 + 72/21 is 769/210.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
14/60 = 14 × 7/60 × 7 = 98/420
Likewise, for the 2nd fraction, since 21 × 20 = 420,
72/21 = 72 × 20/21 × 20 = 1440/420
Add the two like fractions:
98/420 + 1440/420 = 98 + 1440/420 = 1538/420
1538/420 simplified gives 769/210
So, 14/60 + 72/21 = 769/210
In mixed form: 3139/210

MathStep (Works offline)

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