Rapid addition and subtraction of maximum single digit numbers by a child
The record for performing rapid addition and subtraction of the maximum number of single digit numbers was set by Siya Abhijit Shirsekar (born on January 31, 2013) of Mumbai, Maharashtra. She rapidly added and subtracted 110 single digit numbers flashing on the screen (with a speed of 0.4 seconds) in 45 seconds at the age of 10 years, 2 months and 25 days, as confirmed on April 25, 2023.