Marathon-mental-math-Addition.jpg

Pratik Dash (b Sept 24, 2004) of Ascent Abacus, Gurgaon, Haryana accurately solved the addition of 600 rows of 1 digit number flashed on a screen at a speed of 0.6 sec on Flash Anzan on June 29, 2015. His performance was monitored by Anant Kasibhatla of My Memory Zone, New Delhi.