Add 54/60 and 80/7, Solve 54/60 + 11 3/7 as a fraction

Add 54/60 and 80/7

1^st number: 54/60, 2^nd number: 11 3/7

54/60 + 80/7 is 863/70.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 7 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 60 × 7 = 420,
54/60 = 54 × 7/60 × 7 = 378/420
Likewise, for the 2nd fraction, since 7 × 60 = 420,
80/7 = 80 × 60/7 × 60 = 4800/420
Add the two like fractions:
378/420 + 4800/420 = 378 + 4800/420 = 5178/420
5178/420 simplified gives 863/70
So, 54/60 + 80/7 = 863/70
In mixed form: 1223/70

MathStep (Works offline)

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