'Wonder Years' star Danica McKellar explains why she became a mathematician and stopped acting

(CNN) "The Wonder Years" actress Danica McKellar left acting to pursue a mathematics career and now she's explaining why.

McKellar's young son Draco recently interviewed his mom for ET, asking her, "You were about my age when you acted in 'The Wonder Years.' What do you remember most about those years?"

McKellar said it was hard to balance work and school.

"What I remember the most is juggling being an actress and doing my schoolwork," she said. "It was a lot of going back and forth to the school trailer."

While taking a break from acting for some time, she became an acclaimed mathematician. McKellar has also authored 11 children's books about math.