A collection of mathematical riddles involving people, animals, coins, or food.

Playing with mathematical riddles can be an intriguing and fun-filled pastime — as popular science writer Martin Gardner proves in this entertaining collectio

Here are over 300 tantalizing puzzles, brain teasers and riddles by one of the greatest mathematical geniuses of the twentieth century, Shakuntala Devi, popular

The more you use the brain, the more it grows. Many in this world have never had the ‘pleasure of using one’s brain’. They know not what joy and gratifica

Simple Cross Number is constructed on a crossword grid just like a standard crossword, but the digits 1 to 9 are used instead of the letters of the alphabet. In