The Minnesota School Mathematics and Science Teaching (MINNEMAST) Project is characterized by its emphasis on the coordination of mathematics and science in the elementary school curriculum. Units are planned to provide children with activities in which they learn various concepts from both subject areas. Each subject is used to support and reinforce the other where appropriate, with common techniques and concepts being sought and exploited. Content is presented in story fashion. The stories serve to introduce concepts and lead to activities. Imbedded in the pictures that accompany the stories are examples of the concepts presented. This booklet presents a unit on map reading and ordinal numbers. The activities include placing objects in specified orders and describing the location of an object by its ordinal position among a set of objects laid out in a row. Mapping activities include describing paths on a grid using north, east, west and south to indicate the direction of movement. Worksheets and commentaries to the teacher are provided and additional activities are suggested. (JP)