Add 70/30 and 81/7, Solve 2 10/30 + 11 4/7 as a fraction

Add 70/30 and 81/7

1^st number: 2 10/30, 2^nd number: 11 4/7

70/30 + 81/7 is 292/21.

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,
70/30 = 70 × 7/30 × 7 = 490/210
Likewise, for the 2nd fraction, since 7 × 30 = 210,
81/7 = 81 × 30/7 × 30 = 2430/210
Add the two like fractions:
490/210 + 2430/210 = 490 + 2430/210 = 2920/210
2920/210 simplified gives 292/21
So, 70/30 + 81/7 = 292/21
In mixed form: 1319/21

MathStep (Works offline)

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