This publication presents teaching strategies to develop understanding of fractions as sensible numbers. Written for the mathematics teacher in grades K-5, it gives suggestions for teacher-led discussions and structured exploratory activities. The activities are conducted with manipulative materials that emphasize the important characteristics and properties of fractions. Sections focus on: the idea that fractions are rational, a developmental sequence for teaching fraction concepts, concrete models for teaching fractions, models for fractions greater than one, models for equivalent fractions, and teaching to improve problem-solving skills. Appended are pages of dot paper, centimeter graph paper, pattern blocks, and a tangram. References are also included. (MNS)