Some
Brain Teasers
Martyn Steel's sent in these puzzles that he says work
very well with 10 and 11 year olds. Martyn has kindly supplied some
possible answers.
In a 6 x 4 milkcrate
arrange 18 bottles so that when added vertically or horizontally the number
of bottles when added is always even.
Place 8 Queens on
a chessboard so that no Queen is in a position to take another.
Starting at any one
corner of a chessboard visit every square with a Knight without duplicating
a visit.