Add 5/42 and 50/21, Solve 5/42 + 2 8/21 as a fraction

Add 5/42 and 50/21

1^st number: 5/42, 2^nd number: 2 8/21

5/42 + 50/21 is 5/2.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 42 × 1 = 42,
5/42 = 5 × 1/42 × 1 = 5/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
50/21 = 50 × 2/21 × 2 = 100/42
Add the two like fractions:
5/42 + 100/42 = 5 + 100/42 = 105/42
105/42 simplified gives 5/2
So, 5/42 + 50/21 = 5/2
In mixed form: 21/2

MathStep (Works offline)

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