"Today, there have been 85 million users to date. Each month, there are 6 million unique users on the Khan Academy site. In total, there have been 260 million lessons delivered and over 1 billion problems answered on the related exercises."
http://jpalfrey.andover.edu/2013/05/09/khan-academy-meets-ph...
"Today, there have been 85 million users to date. Each month, there are 6 million unique users on the Khan Academy site. In total, there have been 260 million lessons delivered and over 1 billion problems answered on the related exercises." http://jpalfrey.andover.edu/2013/05/09/khan-academy-meets-ph...