The record for solving the maximum number of single-digit addition and subtraction sums was set by Avni Hari (born on September 10, 2019) of Ernakulam, Kerala. She mentally added and subtracted 45 single-digit sums (consisting of multiple terms) non-stop in 5 minutes and answered all questions correctly, at the age of 4 years, 8 months and 17 days.