Implementation of Lesson Study in Arranging "Merdeka Belajar" Activities of Mathematics in SMPN Neonbat Kefamenanu - Laja, Yosepha; Fitriani, Fitriani; Ahzan, Zulkaidah; Nainhas, Ermelinda (Alamtana: Jurnal Pengabdian Masyarakat UNW Mataram, 2023)