A lot of what's going on today in Marna Wolak's fifth-grade math class is pretty familiar. She's got her students gathered on the rug for a number talk, something she does often, trying to get them thinking about fractions.
But a lot of it is unfamiliar, too. The topic is new — dividing whole numbers by fractions. Also, today there are five more adults in the room, including two other teachers from Sanchez Elementary School here in San Francisco.