Add 3/80 and 45/28, Solve 3/80 + 1 17/28 as a fraction

Add 3/80 and 45/28

1^st number: 3/80, 2^nd number: 1 17/28

3/80 + 45/28 is 921/560.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 28 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
3/80 = 3 × 7/80 × 7 = 21/560
Likewise, for the 2nd fraction, since 28 × 20 = 560,
45/28 = 45 × 20/28 × 20 = 900/560
Add the two like fractions:
21/560 + 900/560 = 21 + 900/560 = 921/560
So, 3/80 + 45/28 = 921/560
In mixed form: 1361/560

MathStep (Works offline)

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