Secret Number
The object of the game is for the girls to guess what number you have created. Using a number of pens, pencils, paintbrushes, or sticks, lay out a pattern on the floor. Then ask the girls what number it is (between 0-10). Once you've laid out the pattern, fold your arms across your chest, leaving the number of fingers "exposed" (as opposed to tucked in your armpits) that you've decided the number is going to be. For example, if you've created a pattern that you've decided is the number 3, you leave 3 fingers exposed when you cross your arms.
SECRET: The girls must figure out that it's the number of fingers you have showing, and NOT the pattern of sticks, which is important.