Eighth-grader Kaloyan Geshev from the 125th Secondary School Boyan Penev in Sofia won his 4th world title in mental calculation thanks to his speed, accuracy and incredible concentration. The 2025 Mental Calculations World Championships Final..
Seventh-grader Kaloyan Geshev from the 125th High School "Boyan Penev" in Sofia became a three-time champion in mental calculation. He won first place at the Mental Calculation Olympiad, which was held online. Kaloyan scored 243 points and thus..
12-year old Kaloyan Geshev from Sofia has defended his world title in mental calculation. For the second year running he won the gold, the organizers of the Mental Calculation World Cup say. The silver and the bronze went to contenders from India...
