Question

write divisibility test for 3and4​

Answer 1

Divisibility Rules for 3

Divisibility rule for 3 states that a number is completely divisible by 3 if the sum of its digits is divisible by 3. Consider a number, 308. To check whether 308 is divisible by 3 or not, take sum of the digits (i.e. 3+0+8= 11). Now check whether the sum is divisible by 3 or not.

Divisibility by 4

A number is divisible by 4 if the number formed by its digits in tens and units place is divisible by 4. In other words, a number is divisible by 4, if the number formed by its last 2 digits is divisible by 4.