Transposed Divisor

Number Theory Level 1

If $N$ is divisible by 81, must $N$ be divisible by 18 as well?

Yes No

2 solutions

Zee Ell
Sep 29, 2016

81 (and any odd multiple of 81) is divisible by 81, but not divisible by 18.

Hence, our answer is:

$\boxed {No}$

Munem Shahriar
Jan 25, 2018

81 is not divisible by 18. Hence the answer is $\boxed{\text{no}}$

A simpler way to solve this without any calculation is to show that an odd number can never be divisible by and even number.

Pi Han Goh - 3 years, 4 months ago