Add 70/21 and 7/27, Solve 3 7/21 + 7/27 as a fraction

Add 70/21 and 7/27

1^st number: 3 7/21, 2^nd number: 7/27

70/21 + 7/27 is 97/27.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 21 × 9 = 189,
70/21 = 70 × 9/21 × 9 = 630/189
Likewise, for the 2nd fraction, since 27 × 7 = 189,
7/27 = 7 × 7/27 × 7 = 49/189
Add the two like fractions:
630/189 + 49/189 = 630 + 49/189 = 679/189
679/189 simplified gives 97/27
So, 70/21 + 7/27 = 97/27
In mixed form: 316/27

MathStep (Works offline)

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