Edtech startup Byju's has acquired Bengaluru-based math learning startup Math Adventures in its fourth acquisition for an undisclosed amount. As part of the deal, the team at Math Adventures will join the content, research, and development team at Byju's, the startup's CEO Byju Raveendran said. Byju's earlier acquisitions include TutorVista, Edurite, and data analytics platform Vidyartha.