Add 20/7 and 36/81, Solve 2 6/7 + 36/81 as a fraction

Add 20/7 and 36/81

1^st number: 2 6/7, 2^nd number: 36/81

20/7 + 36/81 is 208/63.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567

Next, find the equivalent fraction of both fractional numbers with denominator 567
For the 1st fraction, since 7 × 81 = 567,
20/7 = 20 × 81/7 × 81 = 1620/567
Likewise, for the 2nd fraction, since 81 × 7 = 567,
36/81 = 36 × 7/81 × 7 = 252/567
Add the two like fractions:
1620/567 + 252/567 = 1620 + 252/567 = 1872/567
1872/567 simplified gives 208/63
So, 20/7 + 36/81 = 208/63
In mixed form: 319/63

MathStep (Works offline)

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