Add 72/30 and 98/21, Solve 2 12/30 + 4 14/21 as a fraction

Add 72/30 and 98/21

1^st number: 2 12/30, 2^nd number: 4 14/21

72/30 + 98/21 is 106/15.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
72/30 = 72 × 7/30 × 7 = 504/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
98/21 = 98 × 10/21 × 10 = 980/210
Add the two like fractions:
504/210 + 980/210 = 504 + 980/210 = 1484/210
1484/210 simplified gives 106/15
So, 72/30 + 98/21 = 106/15
In mixed form: 71/15

MathStep (Works offline)

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