Add 9/42 and 28/8, Solve 9/42 + 3 4/8 as a fraction

Add 9/42 and 28/8

1^st number: 9/42, 2^nd number: 3 4/8

9/42 + 28/8 is 26/7.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 42 × 4 = 168,
9/42 = 9 × 4/42 × 4 = 36/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
28/8 = 28 × 21/8 × 21 = 588/168
Add the two like fractions:
36/168 + 588/168 = 36 + 588/168 = 624/168
624/168 simplified gives 26/7
So, 9/42 + 28/8 = 26/7
In mixed form: 35/7

MathStep (Works offline)

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