Then get the kids involved. They can learn plenty by strategizing their trick-or-treating route, said Brian Marks, an instructional math coach for Newton Public Schools outside Boston. "It takes kids beyond skill work and engages them in real-life problem solving," said Marks, who is also the creator of resource site YummyMath.com. The site's Halloween lessons include activities to calculate which container will hold the most candy and determine the most efficient path from house to house.
Read MoreHalloween costumes—for the 1%
"You start to think about, how long is this going to take you?" Marks said. "What's the best way to go through the neighborhood?" Kids might find it makes more sense to zig-zag instead of loop down a street, for example, or see on a map which of the good neighborhoods has the smallest lawns—and so, the potential for shorter trips door-to-door, and more candy.