Hyderabad, Feb. 20 -- At a time when we have become accustomed to pulling out calculators for the simplest of calculations, 14-year-old Aaryan Shukla from Maharashtra pulls out results faster than you can type them into the machine.

Setting six world records in one day, Aaryan has made it onto the Guinness World Record (GWR) list for the second time. Last year, on the Italian TV show 'Lo Show dei Record' he set the record for the fastest time to mentally add 50 five-digit numbers by adding all the numbers in a mere 25.19 seconds. That comes up to one addition every 0.5 seconds.

This year, at a mental math competition held in Dubai, Aaryan cemented his title of a 'human calculator' by achieving a record time in mentally adding 100 four-d...