The lie that Einstein failed at maths as a student has been said so many times that it almost has become true – it appears for example, in the popular newspaper column “Ripley’s Believe it or Not!”.
The truth is that maths came natural for Einstein and he was really good at it. As a teenager, he had already mastered differential and integral calculus. According to his sister, at age of 12 he was solving complicated problems in applied arithmetic. Then he decided to immerse independently in the field of mathematics. With just using textbooks and no teachers at all, the young Einstein had mastered mathematics so well that he even came up with his own original way to prove the Pythagorean theorem.