Question

Determine whether $70169803$ is divisible by $11$

Answer 1

Checking divisibility by $11$-

Divisibility by $11$ : A number is divisible by $11$ if the difference of sum of digits of alternate places is divisible by $0$ or $11$.

Here the sum of digits at odd places

$7+1+9+0=17$

And,

the sum of digits at even places

$0+6+8+3=17$

Therefore , difference of above sum is -

$17-17=0$

Difference is $0$ which is divisible by $0$

Hence , $70169803$ is divisible by $11$