"USC Rossier School of Education, in collaboration with the Mattel Children’s Foundation, has launched “Speedometry™,” a free-to-use curriculum that utilizes Hot Wheels® toys to teach elementary-age students science, technology, engineering and mathematics (STEM). “Speedometry” is tailored for children in fourth grade and emphasizes hands-on discovery and learning."
(Quoted from press release from USC Rossier School of Education, http://rossier.usc.edu/usc-rossier-and-mattel-childrens-foundation-launch-innovative-stem-curriculum-for-fourth-graders/)
Okay, so not really math but still an awesome way to get kids interested in math and physics!