Add 21/60 and 70/27, Solve 21/60 + 2 16/27 as a fraction

Add 21/60 and 70/27

1^st number: 21/60, 2^nd number: 2 16/27

21/60 + 70/27 is 1589/540.

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,
21/60 = 21 × 9/60 × 9 = 189/540
Likewise, for the 2nd fraction, since 27 × 20 = 540,
70/27 = 70 × 20/27 × 20 = 1400/540
Add the two like fractions:
189/540 + 1400/540 = 189 + 1400/540 = 1589/540
So, 21/60 + 70/27 = 1589/540
In mixed form: 2509/540

MathStep (Works offline)

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