The lecture with practitioners series 5 organized by Mathematics Education FMIPA UNY was successfully held on Saturday 11 December 2021 from 09.00-11.00 WIB. On this occasion, the lecture with practitioners series 5 presented Mr. Anton Rusnanto, S.Pd., M.Si who is a practitioner from SMPK 4 Penabur Jakarta with the topic of study “Nonroutine Mathematics”. This joint lecture with practitioners was moderated by Mr. Heru Sukoco, M.Pd. and opened directly by the Coordinator of the S-1 Mathematics Education Study Program, namely Mrs. Endah Retnowati Ph.D. In her remarks, she invited students and all participants who attended to be able to free up time and listen well to the material that would be presented because it would be very useful, not only to complete the lectures being taken, but also as a provision in the future if they become mathematics teachers or developers.

The implementation of this lecture with practitioners utilizes the zoom application and YouTube streaming and is attended by lecturers, S-1 students, S-2 students and mathematics teachers from various levels. Anton Rusnanto, S.Pd., M.Si as the speaker started the presentation by giving an explanation of non-routine mathematical problems then continued by giving examples and at the same time exercises to solve non-routine mathematical problems. Participants were very enthusiastic and eager to follow each series of lectures. It was proven by active participation and high motivation in finding answers to non-routine mathematical problems prepared by the speaker.  (Tim Sy).