Add 15/12 and 4/80, Solve 1 3/12 + 4/80 as a fraction

Add 15/12 and 4/80

1^st number: 1 3/12, 2^nd number: 4/80

15/12 + 4/80 is 13/10.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 80 is 240

Next, find the equivalent fraction of both fractional numbers with denominator 240
For the 1st fraction, since 12 × 20 = 240,
15/12 = 15 × 20/12 × 20 = 300/240
Likewise, for the 2nd fraction, since 80 × 3 = 240,
4/80 = 4 × 3/80 × 3 = 12/240
Add the two like fractions:
300/240 + 12/240 = 300 + 12/240 = 312/240
312/240 simplified gives 13/10
So, 15/12 + 4/80 = 13/10
In mixed form: 13/10

MathStep (Works offline)

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