Cube roots of maximum numbers mentally calculated and written by a child in one minute
The record for mentally calculating and writing the cube roots of maximum numbers in one minute was set by Mallukuntla Puneeth Sai Reddy (born on January 1, 2016) of Bengaluru, Karnataka. He mentally calculated and wrote the cube roots of 42 (four to nine digit) numbers in one minute (under the guidance of VMAT Academy, Bengaluru), using a pen, at the age of 10 years, 1 month and 9 days, as confirmed on February 10, 2026.
