The study of magic squares has a long, long history. In ancient Babylonian times, these array of numbers were held to have magical powers. Over the years, they have also served as protective charms ...

A magic square is an arrangement of numbers where all rows, columns and diagonals add up to the same number, called the magic constant. Can you complete this square by filling in the missing numbers?

This magic square has been known since ancient times. Each row, column and diagonal of three numbers adds to the same magic constant, 15. There is, however, a different type of 3×3 magic square, in ...