Renaye Harvey’s sixth- and seventh-grade classes at North School recently finished a math project that incorporated fractions, proportions and everyday items found in many cupboards and pantries. Harvey asked her students to find a box at home, trace it on graph paper and then duplicate the drawing on larger graph paper to create a box front that was exactly three times larger than the original. The students had to measure, multiply fractions of inches and faithfully reproduce the art on their box of choice. “When I first set out to do this project with these kids, it was proportions,” Harvey said. “But along the way, I found out about how many kids had trouble measuring with a ruler and multiplying fractions. So they got more practice doing that. By the time I was done with them, they knew how to do it.” Harvey said about 70 percent of her roughly 100 students designed and built larger-than-life soap, cereal and video game boxes.