Add 40/7 and 28/81, Solve 5 5/7 + 28/81 as a fraction

Add 40/7 and 28/81

1^st number: 5 5/7, 2^nd number: 28/81

40/7 + 28/81 is 3436/567.

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,
40/7 = 40 × 81/7 × 81 = 3240/567
Likewise, for the 2nd fraction, since 81 × 7 = 567,
28/81 = 28 × 7/81 × 7 = 196/567
Add the two like fractions:
3240/567 + 196/567 = 3240 + 196/567 = 3436/567
So, 40/7 + 28/81 = 3436/567
In mixed form: 634/567

MathStep (Works offline)

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