Mohammed Mahabu Subhani (born on April 16, 2008) of Andhra Pradesh, India, set a record for performing rapid addition of the maximum number of two-digit numbers in 30 seconds. He added 75 numbers flashing on the screen at a fast speed (with a time gap of 0.4 seconds) in 30 seconds and answered correctly at the age of 13 years, 5 months and 11 days, as confirmed on November 15, 2021.