Add 7/21 and 70/54, Solve 7/21 + 1 16/54 as a fraction

Add 7/21 and 70/54

1^st number: 7/21, 2^nd number: 1 16/54

7/21 + 70/54 is 44/27.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 21 × 18 = 378,
7/21 = 7 × 18/21 × 18 = 126/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
70/54 = 70 × 7/54 × 7 = 490/378
Add the two like fractions:
126/378 + 490/378 = 126 + 490/378 = 616/378
616/378 simplified gives 44/27
So, 7/21 + 70/54 = 44/27
In mixed form: 117/27

MathStep (Works offline)

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