For this activity, you'll need the book "Pete the Cat and His Four Groovy Buttons" by Eric Litwin, as well as a variety of buttons in different shapes, sizes and colors. You'll also need a sorting tray or space to sort the buttons into groups by their varying attributes.
Read "Pete the Cat and His Four Groovy Buttons" by Eric Litwin out loud. The story is meant to be sung, so listen to the accompanying song or make your own rhythm and melody!
Talk about the attributes of Pete's buttons that he loses during the course of the story. You may discuss their colors, shapes, sizes, number of holes and so on.
Show the children some of the buttons from your own collection. Talk with the children about the different attributes that are represented in the set.
Have the children sort the buttons into sets using one attribute. Color is often the simplest way to classify them. After that, you may move onto to size, shapes, number of holes, etc.