Add 81/60 and 24/27, Solve 1 21/60 + 24/27 as a fraction

Add 81/60 and 24/27

1^st number: 1 21/60, 2^nd number: 24/27

81/60 + 24/27 is 403/180.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 27 is 540

Next, find the equivalent fraction of both fractional numbers with denominator 540
For the 1st fraction, since 60 × 9 = 540,
81/60 = 81 × 9/60 × 9 = 729/540
Likewise, for the 2nd fraction, since 27 × 20 = 540,
24/27 = 24 × 20/27 × 20 = 480/540
Add the two like fractions:
729/540 + 480/540 = 729 + 480/540 = 1209/540
1209/540 simplified gives 403/180
So, 81/60 + 24/27 = 403/180
In mixed form: 243/180

MathStep (Works offline)

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