All 14 students in the Iranian team have received ranks in the competition, Ali Adeli, head of the national mental arithmetic team said.
Four Iranian participants won the title of champion of champions, two were crowned as champion, with another one won first place and seven others won second place, he added.
The students competed in tough mental arithmetic competitions with more than 600 talented students from 12 countries.
The participants answered 400 questions in 10 minutes, Adeli said.
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