2026. Effects of Jigsaw and Numbered-Head-Together Instructional Strategies on Achievement and Retention in Algebraic Concept among Secondary School Students in Minna Metropolis, Niger State, Nigeria. Federal University Gusau Faculty of Education Journal. 3, 1 (Apr. 2026), 183–193. DOI:https://doi.org/10.64348/zije.2026358.