If the last digit of a number is an even number, then it is divisible by _____.

If a number is divisible by $15$, then it must be divisible by _____.

If a number is divisible by $3$, then $x$ in $3x51$ should have _____.

A number is divisible by _____ if the sum of all its digits is the multiple of $9$.

For any number to be divisible by $5$, the ones digit should be _____.

Which of the following is not divisible by $10$?

Write the next number of the series:

$512,343,216,125,$_____

What does $*$ stand for in the expression $12*3=4$?

If a number is divisible by $35$, then by which two other numbers will it also be divisible?