Add 80/18 and 7/72, Solve 4 8/18 + 7/72 as a fraction

Add 80/18 and 7/72

1^st number: 4 8/18, 2^nd number: 7/72

80/18 + 7/72 is 109/24.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 72 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 18 × 4 = 72,
80/18 = 80 × 4/18 × 4 = 320/72
Likewise, for the 2nd fraction, since 72 × 1 = 72,
7/72 = 7 × 1/72 × 1 = 7/72
Add the two like fractions:
320/72 + 7/72 = 320 + 7/72 = 327/72
327/72 simplified gives 109/24
So, 80/18 + 7/72 = 109/24
In mixed form: 413/24

MathStep (Works offline)

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