Is 21 divisible by 3? In other words, if you divide 21 by 3, will you get a whole number with no remainder?
Of course, you could use a calculator to find out if 21 is divisible by 3, but what fun would that be?
To find out if 21 is divisible by 3, we will add up the numbers that make 21 as follows: 2 + 1 = 3
We know that if the sum of the numbers that make up 21 is divisible by 3, then 21 is divisible by 3.
Since the sum of the digits in 21 is divisible by 3, 21 is also divisible by 3. Thus, the answer to the question "Is 21 divisible by 3?" is as follows:
Yes
Note: If you divide 21 by 3, you get 7 which is a whole number.
Divisible by 3?
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