Rapid addition and subtraction of maximum three-digit numbers by a child
The record for performing the rapid addition and subtraction of the maximum number of three-digit numbers was set by Ronit Sandeep Kadam (born on May 23, 2013) of Mumbai, Maharashtra. He rapidly added and subtracted 60 numbers flashing on the screen at a fast speed (with a time gap of 1 second) in 1 minute and 3 seconds and answered correctly at the age of 9 years, 10 months and 21 days, as confirmed on April 13, 2023.