Intriguing math teasers for ages 11 up, brilliantly answered. – This excellent collection of teasers has inferential problems in arithmetic and algebra, and includes geometry, mazes, magic squares and a lot of chess-board tours. The answers are often gems in themselves – things mentioned in passing and left to the reader to establish – e.g. … of the twelve ways that eight queens can be placed on a chessboard without attacking one another… <p> At twelve years old I spent many an...
