Start by cutting out a large circle from construction paper or cardboard to represent the pizza base. You can use circular templates or trace around a large plate.
Divide the pizza into two equal halves using a marker. Emphasize the concept of halves by drawing a line from the center to the edge.
Color one half of the pizza in a distinct color, and leave the other half blank. For example, color one half brown to represent a topping like chocolate, and leave the other half plain.
Write the fraction "1/2" on the pizza, making sure it corresponds to the colored half.