When ordering pizza – use fractions to discuss the slices and how many pieces everyone ate. I ate 1/2 while you ate 1/3. If I ate 1/2 of a small pizza and you ate 1/3 of an extra-large pizza, did I eat more? If I ate 1/2 of a pizza and you ate 4/8 of the same pizza, who ate more? Lots of authentic ways to teach fractions.
You can also teach the early vocabulary of fractions with young children. When discussing ordering a pizza you can use words like whole, half, and quarter. “Half” the pizza with cheese, and “Half” with pineapple and ham (my favorite). Hmmm…gotta go order pizza for lunch now!
The Educational Journey 