Also known (around Coolmath, anyway) as Guzzinta Tests.
Here are some quick tricks you can learn to see if a number is divisible (can be divided by) another number.? Huh?
OK...? You can see that 18 is divisible by 3... meaning that 3 goes into 18.
Remember your guzzintas?
That's an easy one, since it's from our times tables.
But, can you quickly tell if 3 goes into 237?? Without doing long division?? I can!? And not just because I'm a super math geek -- because I know some cool tricks!? These are good to learn because they will save you lots of time!
Divisibility by 2 Test:
A number is divisible by 2 if it is even.
Here's another way to phrase this one:
A number is divisible by 2 if
Let's do an easy one from our times tables: