Add 56/80 and 98/21, Solve 56/80 + 4 14/21 as a fraction

Add 56/80 and 98/21

1^st number: 56/80, 2^nd number: 4 14/21

56/80 + 98/21 is 161/30.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
56/80 = 56 × 21/80 × 21 = 1176/1680
Likewise, for the 2nd fraction, since 21 × 80 = 1680,
98/21 = 98 × 80/21 × 80 = 7840/1680
Add the two like fractions:
1176/1680 + 7840/1680 = 1176 + 7840/1680 = 9016/1680
9016/1680 simplified gives 161/30
So, 56/80 + 98/21 = 161/30
In mixed form: 511/30

MathStep (Works offline)

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