Add 8/42 and 84/9, Solve 8/42 + 9 3/9 as a fraction

Add 8/42 and 84/9

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

8/42 + 84/9 is 200/21.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
8/42 = 8 × 3/42 × 3 = 24/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
84/9 = 84 × 14/9 × 14 = 1176/126
Add the two like fractions:
24/126 + 1176/126 = 24 + 1176/126 = 1200/126
1200/126 simplified gives 200/21
So, 8/42 + 84/9 = 200/21
In mixed form: 911/21

MathStep (Works offline)

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