This is one of several teacher's guides for the 4M Company, a set of materials for teaching metric concepts and computation. This level of the program extends comparisons from two objects to comparisons involving three or more objects. Vocabulary includes superlatives (longest) as well as comparatives (longer). Students are introduced to six metric units: meter, decimeter, liter, deciliter, gram, and kilogram. They compare these units to properties of common objects and learn to measure with several tools. Conservation of length, liquid, and mass are also included. (Author/RH)