Add 21/18 and 4/56, Solve 1 3/18 + 4/56 as a fraction

Add 21/18 and 4/56

1^st number: 1 3/18, 2^nd number: 4/56

21/18 + 4/56 is 26/21.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 18 × 28 = 504,
21/18 = 21 × 28/18 × 28 = 588/504
Likewise, for the 2nd fraction, since 56 × 9 = 504,
4/56 = 4 × 9/56 × 9 = 36/504
Add the two like fractions:
588/504 + 36/504 = 588 + 36/504 = 624/504
624/504 simplified gives 26/21
So, 21/18 + 4/56 = 26/21
In mixed form: 15/21

MathStep (Works offline)

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