Question

Without actual division, find whether $342218064$ is divisible by $3$ or not.

Answer 1

According to the divisibility test for $3$, if the sum of digits of a number is divisible by $3$ then the number itself is divisible by $3$.

So, applying the divisibility test for $3$,

$3+4+2+2+1+8+6+4=30$

$3+0=3$, which is divisible by $3$.

Hence, the given number is divisible by $3$.