Introduction. It is impossiblet o teach a studenta subjecti n whichh e has littleo rno interestT. his is especiallyt rueo f mathematicsV. eryf ew studentsc are how oldSusan was whenh er motherw as threet imesa s old as she is now. Many games andpuzzles have been inventedw hicha ttemptt o teach mathematicsb, ut it oftens eemsthatt he morem athematicacl ontenti n a game, the less interestinigt is to play.