Do you ever wonder if a number is divisible by other numbers? How do you know if a number is divisible by 3? Simply add the digits of a number, and if the sum of those digits is divisible by 3, the number is divisible by 3 as well.
Is 891 divisible by 3? The sum of the digits 8 + 9 + 1 = 18. 18 is divisible by 3, and you can conclude that 891 is divisible by 3.
Let's try another one that you know is divisible by 3. Is 66 divisible by 3? The sum of the digits 6 + 6 = 12, and 12 is divisible by 3, therefore 66 is divisible by 3.
Try this simple rule each and every time you need to divide a number by three, and it works like magic!
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