Object: A chalkboard, chalk, and eraser.

Good morning, boys and girls. Today we are going to learn something by using a very familiar friend in a different way. [Bring out the chalkboard.] How many of you have used a chalkboard before? What do you do with a chalkboard? [Let them answer.] That’s right, you write on it with chalk. I have a piece of chalk and I will write down some things like 2+2=4, C A T spells cat, and I will draw a picture of a stick man. Can everyone see what I have written on the chalkboard? Good! Now I am going to take my eraser and erase what I have written. [Erase the chalkboard so that the chalk is gone, but the impression remains.] As you can see I have erased 2+2=4, C A T spells cat, and my stick man. They a…