India, Feb. 20 -- A 'human calculator' from India broke six Guinness World Records in one day at the age of just 14 years. Last year, Maharashtra's Aaryan Shukla set the record for the fastest time to mentally add 50 5-digit numbers in front of a live audience. If this was not impressive enough, he achieved the feat in just 25.19 seconds - coming up to approximately one addition every half a second.

He was then invited to Dubai by Guinness World Records and challenged to solve the toughest mental calculation ever attempted. And in just one day, he broke six records: Fastest time to mentally add 100 4-digit numbers, add 200 4-digit numbers, 50 5-digit numbers, divide a 20-digit number by a 10-digit number, multiply 10 sets of 2 5-digit nu...