S.Samith (born on September 1, 2014) of Andhra Pradesh, India is titled as Grand master for solving 150 single digit additions in one minute wing Abacus method. He mentally added 150 single digit numbers non-stop for one minute (with time gap duration of 0.4 seconds) and answered correctly at the age of 6years and 9 months as confirmed on June 9, 2021.