Add 9/30 and 81/7, Solve 9/30 + 11 4/7 as a fraction

Add 9/30 and 81/7

1^st number: 9/30, 2^nd number: 11 4/7

9/30 + 81/7 is 831/70.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
9/30 = 9 × 7/30 × 7 = 63/210
Likewise, for the 2nd fraction, since 7 × 30 = 210,
81/7 = 81 × 30/7 × 30 = 2430/210
Add the two like fractions:
63/210 + 2430/210 = 63 + 2430/210 = 2493/210
2493/210 simplified gives 831/70
So, 9/30 + 81/7 = 831/70
In mixed form: 1161/70

MathStep (Works offline)

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