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Coolmath Pre-Algebra
Prime and Composite Numbers lesson 1 - Divisibility Tests  
(page 4 of 11)

---- This pre-algebra lesson explains how to use divisibility tests.

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Does 10 go into 7,689,320?  ( Is 7,689,320 divisible by 10? ) Yep!

 


YOUR TURN:

Is 378 divisible by 2?
 

Is 729 divisible by 10?
 

Is 590 divisible by 5?
 

Is 83,497 divisible by 2?
 

Is 972,552 divisible by 5?
 

Is 290 divisible by 10?
 


 

The next two take a bit of math, but, once you get good at them, you can do them in your head!

Divisibility by 3 Test:

A number is divisible by 3 if the
sum of its digits
is divisible by
3.

HUH?!

Don't worry -- this is easy!

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.

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