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Divisibility Tests

OK, back to 572...

Does 4 go into 572? ( Is 572 divisible by 4? )


72 / 4 ... subtract 4 from 72 = 32... subtract 32 from 32 = 0... 72 / 4 = 18 ... Yep!
 

So, 572 is divisible by 4.


Here's another one:

Does 4 go into 16,421? ( Is 16,421 divisible by 4? )


No, since 21 is not divisible by 4.
 


Divisibility by 8 Test:

This is a lot like the test for 4, but even less useful.

A number is divisible by 8 if the last three digits are a number that's divisible by 8.


Since we have to look at a three digit number, we're probably not going to be able to eyeball this one.  We'll probably need to do some long division.