The Money Curriculum is based upon the classic Montessori Math Materials for Linear Counting and Base Ten. It consists of card-stock manipulatives and play money.
These and other activities are included in the Money Curriculum.
As of July 2012 the American Montessori Society lists money as part of their core for the Mathematics Curriculum.
(126.96.36.199 Handbook for Teacher Education Program Affiliation AMS)