This document is intended for program and curriculum experts interested in implementing evidence-based early grade mathematics programs. It was developed by the authors of this document, who are mathematics teaching and learning experts with extensive experience adapting evidence-based practices in low and middle-income contexts. Our collective field and research experience, combined with the existing evidence base, led us to focus on four instructional strategies that are key to effective mathematics instruction: 1. Respecting developmental progressions 2. Using mathematical models to represent abstract notions 3. Encouraging children to explain and justify their thinking 4. Making explicit connections for children between formal and informal math While these four instructional strategies are very important, they are not the only instructional strategies that can result in improved learning outcomes. Effective early grade mathematics teachers draw from an extensive repertoire of evidence-based instructional strategies and strive to create a learning environment the supports that development of positive mathematical identities.