Add 54/21 and 30/6, Solve 2 12/21 + 5 0/6 as a fraction

Add 54/21 and 30/6

1^st number: 2 12/21, 2^nd number: 5 0/6

54/21 + 30/6 is 53/7.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 21 × 2 = 42,
54/21 = 54 × 2/21 × 2 = 108/42
Likewise, for the 2nd fraction, since 6 × 7 = 42,
30/6 = 30 × 7/6 × 7 = 210/42
Add the two like fractions:
108/42 + 210/42 = 108 + 210/42 = 318/42
318/42 simplified gives 53/7
So, 54/21 + 30/6 = 53/7
In mixed form: 74/7

MathStep (Works offline)

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