Youngest to do mental calculation using Abacus technique
The record for being the youngest to do mental calculation using Abacus technique was set by Adhavan (born on January 3, 2019) of Chennai, Tamil Nadu. He mentally added and subtracted 100 single and double digit numbers in a single row non-stop in 7 minutes, 50 seconds and 35 milliseconds and gave the correct result, using Abacus technique, at the age of 4 years and 30 days, as confirmed on February 2, 2023.