Mental math's shortcut—pupil dilation suggests people start solving before all numbers are in

People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their ...
Guinness World Records on MSN

Fastest mental addition of ten 10 digit numbers

Aaryan Shukla set a record for the fastest mental addition of ten 10 digit numbers in 1 minute 18.08 seconds.