Maximum single-digit addition and subtraction sums solved orally by a child

The record for orally solving the maximum number of single-digit addition and subtraction sums was set by Devadev S. (born on May 23, 2018) of Palakkad, Kerala. He correctly answered 21 single-digit addition and subtraction sums (each consisting of 4-6 multiple terms) in 4 minutes and 14 seconds, using the Abacus speed calculation technique, at the age of 7 years, 10 months and 28 days, as confirmed on April 20, 2026.