Add 21/2 and 6/81, Solve 10 1/2 + 6/81 as a fraction

Add 21/2 and 6/81

1^st number: 10 1/2, 2^nd number: 6/81

21/2 + 6/81 is 571/54.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162

Next, find the equivalent fraction of both fractional numbers with denominator 162
For the 1st fraction, since 2 × 81 = 162,
21/2 = 21 × 81/2 × 81 = 1701/162
Likewise, for the 2nd fraction, since 81 × 2 = 162,
6/81 = 6 × 2/81 × 2 = 12/162
Add the two like fractions:
1701/162 + 12/162 = 1701 + 12/162 = 1713/162
1713/162 simplified gives 571/54
So, 21/2 + 6/81 = 571/54
In mixed form: 1031/54

MathStep (Works offline)

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