Add 54/9 and 81/18, Solve 6 0/9 + 4 9/18 as a fraction

Add 54/9 and 81/18

1^st number: 6 0/9, 2^nd number: 4 9/18

54/9 + 81/18 is 21/2.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 18 is 18

Next, find the equivalent fraction of both fractional numbers with denominator 18
For the 1st fraction, since 9 × 2 = 18,
54/9 = 54 × 2/9 × 2 = 108/18
Likewise, for the 2nd fraction, since 18 × 1 = 18,
81/18 = 81 × 1/18 × 1 = 81/18
Add the two like fractions:
108/18 + 81/18 = 108 + 81/18 = 189/18
189/18 simplified gives 21/2
So, 54/9 + 81/18 = 21/2
In mixed form: 101/2

MathStep (Works offline)

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