Checking Divisibility of a Number - Aptitude Skills Program Training in SLA Chennai

You can check if a number is divisible by 2, 3, 4, 5 and so on till 13. There are some simple rules to check divisibility. Let us look at some examples for divisibility by 3 and 4.

Divisibility by 3

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A number is divisible by 3 if and only if the sum of the digits is divisible by 3.

Example:

Which of the following two numbers is/are fully divisible by 3: 97533222 or 97533322?

Answer: 97533222

Reason:

Sum of digits for 97533222 = 33 / 3 = 11

Sum of digits for 97533322 = 34 / 3 = 11.33

Divisibility by 4

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A number is divisible by 4 if and only if the last 2 digits is a number divisible by 4.

Example:

Which of the following two number is fully divisible by 4: 5555444446 or 5555444448 ?

Answer: 5555444448

Reason:

Last 2 digits for 5555444446 are 46, 46 is not fully divisible by 4 (46/4 = 11.5)

Last 2 digits for 5555444448 are 48, 48 is fully divisible by 4 (48/4 = 12)

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