Add 21/27 and 4/56, Solve 21/27 + 4/56 as a fraction

Add 21/27 and 4/56

21/27 + 4/56 is 107/126.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 56 is 1512

Next, find the equivalent fraction of both fractional numbers with denominator 1512
For the 1st fraction, since 27 × 56 = 1512,
21/27 = 21 × 56/27 × 56 = 1176/1512
Likewise, for the 2nd fraction, since 56 × 27 = 1512,
4/56 = 4 × 27/56 × 27 = 108/1512
Add the two like fractions:
1176/1512 + 108/1512 = 1176 + 108/1512 = 1284/1512
1284/1512 simplified gives 107/126
So, 21/27 + 4/56 = 107/126

MathStep (Works offline)

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