Add 9/6 and 81/90, Solve 1 3/6 + 81/90 as a fraction

Add 9/6 and 81/90

1^st number: 1 3/6, 2^nd number: 81/90

9/6 + 81/90 is 12/5.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 90 is 90

Next, find the equivalent fraction of both fractional numbers with denominator 90
For the 1st fraction, since 6 × 15 = 90,
9/6 = 9 × 15/6 × 15 = 135/90
Likewise, for the 2nd fraction, since 90 × 1 = 90,
81/90 = 81 × 1/90 × 1 = 81/90
Add the two like fractions:
135/90 + 81/90 = 135 + 81/90 = 216/90
216/90 simplified gives 12/5
So, 9/6 + 81/90 = 12/5
In mixed form: 22/5

MathStep (Works offline)

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