Cognitive Guided Instruction (CGI) is a constructivist approach to teaching mathematics. CGI is not a formal program of instruction but rather an approach to teaching mathematics. Teachers use their students' understanding of mathematics to guide instruction. CGI requires intensive collaboration among students and is helpful in the development of biliteracy. This workshop will briefly overview CGI and how it aligns to the Common Core. The presenters will share how CGI is implemented in two Spanish dual immersion classrooms.