Divisibility Rules with Scratch

Elementary and middle school students benefit from knowing basic divisibility rules.  The four basic divisibility rules are:

A number can be divided by 2 if it ends in 2,4,6,8, or 0

A number can be divided by 2 if the sum of its digits can be divided by 3.  (Also helps students understand the difference between digits and numbers.)

A number can be divided by 5 if the number ends in 5 or 0.

A number can be divided by 10 if it ends in 0.

There are others, but these are essential.

If students are able to program a computer to follow the rules, then you can be pretty sure that they understand the rules.  Also, this program uses a mod operation, which is a cool thing for a middle school kid to learn.

Source code is here .  There are better ways to do this, I'm sure.