Add 81/6 and 45/4, Solve 13 3/6 + 11 1/4 as a fraction

Add 81/6 and 45/4

1^st number: 13 3/6, 2^nd number: 11 1/4

81/6 + 45/4 is 99/4.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 4 is 12

Next, find the equivalent fraction of both fractional numbers with denominator 12
For the 1st fraction, since 6 × 2 = 12,
81/6 = 81 × 2/6 × 2 = 162/12
Likewise, for the 2nd fraction, since 4 × 3 = 12,
45/4 = 45 × 3/4 × 3 = 135/12
Add the two like fractions:
162/12 + 135/12 = 162 + 135/12 = 297/12
297/12 simplified gives 99/4
So, 81/6 + 45/4 = 99/4
In mixed form: 243/4

MathStep (Works offline)

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