Continuing the theme of the school as a community, the teacher's guide to the science/math strand of unit five presents both instructional and assessment activities for kits 17-20. Focus, materials and objective for each activity are in Spanish and English; teacher instructions are in Spanish only. In kit 17 the science activities deal with the environmental components of the universe: matter, energy and force. The concept of change is introduced, and a histogram is developed and utilized. Solids and liquids are identified, and liquids are combined in order to observe their appearance, solubility, and density. In kit 18, students identify the interaction of the environmental components within the school environment, measure and chart temperatures, and work with clocks, sundials, and shadow sizes to show times of day. Kit 19 treats weather. Clouds are observed, imaginary daily weather conditions are recorded, and a weather chart is constructed. Students learn to distinguish between inference and observation. Kit 20 is concerned with equilibrium as it occurs in nature and how it is affected by interaction. Math activities include reviewing first grade concepts, counting by 5's to 100, adding and subtracting combinations from 1 to 10, ordering and comparing numbers, and adding numerals by 2's to 20. (DS)