Chandan Singh Gughtyal has been teaching Maths in boarding schools in India for about 28 years. He has experience of working as an assistant housemaster, housemaster, resident dorm parent, and dorm ...

Math Riddles: Find out how brilliant you are. Only 1% of people with a high IQ can find the missing numbers in these tricky logic math puzzles in 20 seconds each.

Frank A. Farris does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...