This experimental study explored the effect of the 4WsHs active learning model on learning engagement in mathematics classes. The research design used for conducting this study was true experimental research design (pre-test post-test equivalent group design). A sample comprising 190 students selected from two public sector schools was divided into experimental and control groups using a matched random sampling technique. The newly developed active learning model was used as treatment for an experimental group while the same contents of mathematics were taught to the control group using a traditional method. After practice of three months, learning engagement of both groups was measured using a classroom observation checklist. The analyzed data revealed a significant superiority of students belonging to the experimental group over their counterparts in learning engagement. Hence, the newly developed active learning model proved to be effective for developing learning engagement among students.