Add 80/30 and 45/21, Solve 2 20/30 + 2 3/21 as a fraction

Add 80/30 and 45/21

1^st number: 2 20/30, 2^nd number: 2 3/21

80/30 + 45/21 is 101/21.

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,
80/30 = 80 × 7/30 × 7 = 560/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
45/21 = 45 × 10/21 × 10 = 450/210
Add the two like fractions:
560/210 + 450/210 = 560 + 450/210 = 1010/210
1010/210 simplified gives 101/21
So, 80/30 + 45/21 = 101/21
In mixed form: 417/21

MathStep (Works offline)

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