Add 81/14 and 20/60, Solve 5 11/14 + 20/60 as a fraction

Add 81/14 and 20/60

1^st number: 5 11/14, 2^nd number: 20/60

81/14 + 20/60 is 257/42.

Find the least common denominator or LCM of the two denominators:
LCM of 14 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 14 × 30 = 420,
81/14 = 81 × 30/14 × 30 = 2430/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
20/60 = 20 × 7/60 × 7 = 140/420
Add the two like fractions:
2430/420 + 140/420 = 2430 + 140/420 = 2570/420
2570/420 simplified gives 257/42
So, 81/14 + 20/60 = 257/42
In mixed form: 65/42

MathStep (Works offline)

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