Math Contest! – How long is the RED line?
11:19
Can YOU find the number? – Math Puzzle
12:11
When a genius misses an easy question
18:39
Can you crack this beautiful equation? – University exam question
32:50
MIT Entrance Exam from 1869! – Can you solve it?
11:17
Which number is larger? – Math puzzle
13:53
Calculate logarithms in your head! – Without calculator
15:38
Which numbers are missing? – Math puzzle
9:19