Here's how we add
Since our denominators match, we can add the numerators.
1 + 3 = 4
This yields the answer
The last step is to reduce the fraction if we can.
To find out, we try dividing it by 2...
Nope! So now we try the next greatest prime number, 3...
Nope! So now we try the next greatest prime number, 5...
No good. 5 is larger than 4. So we're done reducing.
There you have it! Here's the final answer to 1/7 + 3/7