With a dinnertime mystery and 5 hungry suspects, Charlie Piechart makes fractions fun. Charlie Piechart has a piechart for a belly, and it's a belly that's perfect for showing fractions. In his first mystery, perfect for little math enthusiasts, it's pizza night at the Piecharts' house. How about veggies on top? "NO VEGGIES " yell 4/6 of the pizza eaters. No one wants anchovies, either. They like Charlie's idea best: pepperoni. But...