This project will develop transmedia kits including videos, games, creation tools, character cards, and comic books to engage and support Kindergarten to grade five students in learning strategies to understand abstract mathematical topics, such as such as on misconceptions related to place value and multi-digit operations. The kits will be a supplemental resource for elementary teachers looking to support instructional practice. The Phase I project will produce a prototype kit with resources addressing a specific math learning objective. At the end of Phase I, in a pilot study with 48 students in 2 second-grade classrooms, the researchers will examine how teachers use the kits, whether students are engaged in the materials, and how well students explain mathematical concepts.