Base arithmetic

First, let's add up the two numbers. We get $3578 + 2238 = 5816$

Now, we want to convert 5816 to base 8. 

First, we have to do $5816/8$. We get a quotient of 727 and a remainder of 0.

Next, we have $727/8$. There's a remainder of 7 but a quotient of 90. 

Doing $90/8$ has a quotient of 11 and a remainder of 2.

$11/8 = 1 R 3$

$1/8=0R1$

So for our final answer, we get $13270_8$

Thanks! :)