My name is Hadi Mohammadi, a mathematics teacher and a PhD in mathematics from Tehran Polytechnic University. I have more than 28 years of teaching experience in universities, schools, and I am a university faculty member. • For many years, I have been teaching students from grade 7 to university level online from the United States, England, Australia, Canada, Italy, Germany, Belgium, the Netherlands, and Spain, according to their educational systems. • All books presented in the Telegram group “International Mathematics Education: International_Mathematics ” are prepared and presented.