The aim of the current study is to assess the feasibility of implementing integrated math and EF activities with teachers in preK classrooms—as well as an accompanying program of instructional coaching support. These activities will be implemented during circle-time and small-group instruction in 10 Los Angeles-based Head Start classrooms. Teachers will implement integrated activities using easily creatable materials, as well as exercise agency in tailoring the activities to complement their existing curricula and schedule of the day. Each activity covers a specific math topic (e.g., geometry; addition; patterning, etc.) integrated with EF—explicitly exercising working memory, response inhibition and cognitive flexibility skills. The coaching framework will serve as a foundation to support Los Angeles based Head Start Centers in the increased inclusion of math and other STEM-based instruction in the classroom, while simultaneously enhancing children’s EF development.