Monsters on my Shelf
skip count by 3

Monsters, Monsters,
Come to scare me,
Some are bald,

Some are hairy!!!

There's not 1,

There's not 2,

Come in 3's,

What they do!!!
3, then 6,
Then 9, then 12,
15 monsters on my shelf!  
Start with 3,

Then 6,
/
Then 9,
//
Monsters scare me,
Every time!
Now there's 12,
///
Now 15,
////
Can you see there's 2 between...
3 and 6, and 9, and 12,
Each bald monster on my shelf!