We consider that an octal digit may be represented as three binary digits since $8=2^3$. The octal digit $7_8$ corresponds to $111_2$, $6_8=110_2$, etc. So, to convert the binary number to octal, we convert digits in groups of 3.   $$111\mid010\mid101\mid110_2=7\mid2\mid5\mid6_8$$Now we add the two numbers in octal: $ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & & 3 & 2 & 4_8\\ &+ & 7 & 2 & 5 & 6_8\\ \cline{2-6} & & 7 & 6 & 0 & 2_8\\ \end{array} $. The answer is $\boxed{7602_8}$.
Sum $324_8$ and $111010101110_2$, expressing your answer in base 8.
{'answer': '7602_8', 'subject': 'Number Theory', 'level': 4, 'unique_id': 'test/number_theory/1227.json'}