Research and history has demonstrated the overwhelming disparity and gap of mathematical achievement between African Americans and their White counterparts. According to the National Assessment of Educational Progress (NAEP), the achievement gap on a national level is prevalent. The USA jurisdiction has Black 8th grade math students results at 12% and the White 8th Grade math students at 45%, which gives a White-Black gap of 33% for the nation. This research presents a platform to assist in effectuating change for teachers in their practice to improve student achievement for African American students finding the research based Houghton Mifflin Harcourt "GO Math!" program. The program substantiates their ability to assist students both black and white improve their understanding, achievement and test scores in mathematics. To validate the claim, this case study acquires the teacher's perspective based on the proven effective strategies in research for African American students and if they are embedded within the Go Math program. The teachers of Math in grades three through five using Go Math all voluntarily participated in the focus groups and individual interviews. The findings of this qualitative case study revealed the teachers' use of four major effective strategies of Feedback, Meta-Cognition, Direct Instruction, and Culturally Responsive Pedagogy, and the effect they have on African American students and their achievement in math. The data also revealed that these four strategies were found embedded within the Go Math program and major factors for the students' mathematical success. In spite of the program's lack of implementation with fidelity due to insufficient professional development, the African American students achieved math success and growth through the teachers' exploratory and developmental use of the program. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]