Music might be Justin Bieber's forte but maths is certainly not.
Showing that math isn't his strongest subject, the 21-year-old singer, who took the stage to perform in Toronto, showed that for him calculations can be very hard.
While poking fun at his underage girls fas, the 'Never Say Never' hit-maker was spotted using his fingers to calculate the small numbers.
"Who's 13? We got any 14-year-olds ? Uh, so. 14...," he said using his fingers to add four to 14. "Four more years until you're 18.", E! Online reports.
During his show at the Danforth Music Hall, Bieber also made an inappropriate jokes about underage girls.
