how do you know if 585 is divisible by 2 3 4 5 6 8 9 10 12?

Question

how do you know if 585 is divisible by 2 3 4 5 6 8 9 10 12 and prime or composite and also 76 and 8001 i need help is there a web site that can help me

Answer 1

I can give you a few "tests" for divisibility...

If the number in the ones position is divisible by 2, then the entire number is divisible by 2.

If all of the digits in the number add up to something that is divisible by 3, then the number is divisible by 3.

If the number ends in a zero or 5, it is divisible by 5.

If the number ends in a zero, it is divisble by 10.

Here's a web page all about divisibility rules...

http://www.mathgoodies.com/lessons/vol3/divisibility.html

Answer 2

To be divisible by ...
2 ... a number must be even
3 ... add up the digits; if the sum is divisible by 3, the number is. (For example, in 585, 5 + 8 + 5 = 18; since 3 goes into 18, it will go into 585.)
4 ... the last two digits must be divisible by 4.
5 ... the number must end in either 0 or 5
6 ... the number must be even and divisible by 3 (see above)
8 ... the last three digits must be divisible by 8
9 ... add up the digits; if the sum is divisible by 9, the number is (For example, in 8001, 8 + 0 + 0 + 1 = 9, so the whole number is divisible by 9)
10 ... the number ends in 0
12 ... the number is divisible by 3 and 4 (see above)
You can, of course, also divide the number by each of these and see if it comes out even.

A prime number is divisible only by 1 and itself. None of the numbers you give are prime, because all of them are divisible by at least one of the numbers above. Composite means "not prime".

Answer 3

If the number is even, it's divisible by 2.
If a number has a 0 at the end, it's divisible by 10.
If a number has a 5 or 0 at the end, it's divisible by 5.

Answer 4

You have to remember that 5 is an un-even number and the only even number is 8
You then can devide 2 into 8 or 4 into 8 but what you r looking for is a number thst can go into 5. So this is what I would do 2 cannot go into 5 because there will be 1 remainder.I would used 6

Answer 5

585 NOT div by2,4,6,8,10,12 being an odd number
5+8+5=18,multple of 3 and 9,so div by 3,9

76=7+6=13, not a multiple of 3 and so NOT div by 3,6,9,12
76 not div by 5 as not ending in 5 and 10 as not ending in 0
76 div by 2 and 4 and not 8

8001 NOT div by2,4,6,8,10,12 as it is an odd no.
8+0+0+1=9,multiple of 3 and 9 so div by 3and 9
not div by 5 as it is not ending in 5 or 0