FForty Problems for the ClassroomForty Problems for the Classroomde Derek BallEdiciones (1)Forty Problems for the Classroom (2003)Association of Teachers of Mathematics · ISBN 9781898611226Más obras de Derek BallAAdvanced PowerBuilder 5.0Advanced PowerBuilder 5.0MMental health and the law in ScotlandMental health and the law in ScotlandOOfficial Power (plus plus)Official Power (plus plus)