Seventh root of maximum numbers calculated manually by a child in one minute
The record for manually calculating the seventh root of maximum numbers in one minute was set by Doddi Srikara Ishani Dishi (born on September 20, 2013) of Visakhapatnam, Andhra Pradesh. She manually calculated the seventh root of 60 random numbers (of 8 to 14 digits) in one minute and wrote the answers on a sheet of paper (under the guidance of VMAT Academy, Bengaluru), at the age of 12 years, 5 months and 5 days, as confirmed on February 25, 2026.
