The conference will be presented jointly by Thailand Society of Mathematics Education (TSMEd), Institute for Research and Development in Teaching Profession for ASEAN (IRDTP), Khon Kaen University (KKU), Centre of Excellence in Mathematics (CEM), Center for Promotion of Mathematical Research of Thailand (CEPMART), the Mathematical Association of Thailand Under the Patronage of His Majesty the King, the Institute for the Promotion of Teaching Science and Technology (IPST), Center for Research in Mathematics Education (CRME), and the Educational Foundation for Development of Thinking Skills (EDTS).