Designed to supplement the mathematics-science curriculum, this booklet contains activities which provide students of grades three and four with opportunities for investigating science and applying mathematics skills on the topics of the human body and foods. The exercises are written to meet a variety of lesson needs: to introduce a concept, to enrich and extend, or to conclude, a concept. Ten mathematics skills and nine science skills are listed and indexed for the nine activities on the human body and nine activities on foods. Each activity consists of student sheets and a teacher's guide. The teacher's guide contains information on the activities including: (1) topic area; (2) introductory statement; (3) math and science skills; (4) required materials; (5) key questions; (6) background information; (7) management details; (8) instructional procedures; (9) student procedures; (10) discussion questions; (11) activity extensions; and (12) curriculum coordinates. (ML)