It is always tough to remember what a big number can be divisible by. I know from experience. Once I learned these tricks it helped me so much. I hope they can help you too.
Divisibility by 0
Divisibility by zero is undefined. You can't get an answer from it you just gets nothing. For example, 1 divided by 0 is undefined. You just can't do it.
Divisible by 1
Everyone knows that one divided by something is always one. Right? Well, if you didn't now you know.
Divisible by 2
Divisibility by two is simple. All you have to do is see if the number ends with 0,2,4,6,or 8.
For example, 17,308 ends in an eight so you know it is divisible by 2. The answer will be 8,654.
Divisible by 3
Divisibility by three is a little tricky. So if the sum of the number is divisible by three then it can be divided by three. For example, if we had the number 405 then you would add the numbers together. 4+0+5=9 and 9 is divisible by three. Now you know that 405 can be divided by 3.
Divisible by 4
Divisibility by four has to do with the last two digits of a large number. So if the last two digits of a large number are divisible by four then you know that the number can be divided by four. For example, If you had 30,016 you know that the last two digits,16, is divisible by four.
Divisible by 5
Divisibility by five is the easiest of them all. If the number ends in 5 or 0 it is divisible by five. For example, 10 is divisible by five because it ends in zero.
Divisible by 6
To know if a number is divisible by six you have to know if it is divisible by 2 and by 3. So go back to the top to see how to be divide by 2 and 3. To show you how if we had the number 12 you know it is divisible by two because 12 ends in 2. Also, you know it is divisible by 3 because 2+1=3.
Divisible by 9
The divisibility rule for nine is the same as the rule for three. If the sum of a digit is a multiple of nine then you know it is divisible by nine. For example, 99 can be divided by 9 because 9+9=18 and 18 is a multiple of 9. So you can divide the number by nine.
Divisible by 10
Divisibility by ten is really easy. If the number ens in a zero it is divisible by ten. To show you, if you had the number 10000000000000000000000000000000000000000 you would know it is divisible by ten because it ends in zero.
Did you like it? Were you confused? Leave me a comment and tell me how you feel.
A happy person who loves doing math problems all day.