Add 9/80 and 12/10, Solve 9/80 + 1 2/10 as a fraction

Add 9/80 and 12/10

1^st number: 9/80, 2^nd number: 1 2/10

9/80 + 12/10 is 21/16.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 10 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 80 × 1 = 80,
9/80 = 9 × 1/80 × 1 = 9/80
Likewise, for the 2nd fraction, since 10 × 8 = 80,
12/10 = 12 × 8/10 × 8 = 96/80
Add the two like fractions:
9/80 + 96/80 = 9 + 96/80 = 105/80
105/80 simplified gives 21/16
So, 9/80 + 12/10 = 21/16
In mixed form: 15/16

MathStep (Works offline)

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