Presents an activity incorporating basic terminology, concepts, and solution methods of graph theory in the context of solving problems related to air travel. Discusses prerequisite knowledge and resources and includes a teacher's guide with a student worksheet. (KHR)

Investigates how teachers can build student understanding of what constitutes a reasonable estimate. Includes activities to develop quantity and measurement estimation. (KHR)

Describes a unit of study focusing on tessellations to show students another view of mathematics. (Author)

Describes a three-step process--exploring, inventing, and discovering--that helps students derive concepts actively from problem solving. (YDS)

Presents a framework to gather information about student interests then create problem-solving situations based on those interests. This activity can help give equal access to mathematics for all students, including those who have historically had difficulty with mathematics as presented in schools. (KHR)

Presents a classroom activity in which students build and learn to use their own abacuses. Describes the lesson that combines mathematics, art, and social studies. (KHR)

Examines methods and types of estimation. Characterizes fruitful in-class estimation tasks by exploring the validity and possible extensions of "marble jar" estimation. (KHR)

Features activities and problems designed to appeal directly to students and be relevant to today's world. (KHR)

Provides an historical look at probability games of chance and some of the mathematicians involved in the development of basic concepts. Includes exploratory activities for students. (YDS)

Uses spatial visualization to make connections among Zeno's paradox, geometry, fractions, infinite series, and limits. (YDS)

Presents an activity in which students predict the growth of the population of the United Stated using three different models. (Author/NB)

Presents an activity using similar rectangles to help children conceptualize ratio relationships in several different ways. Develops proportional reasoning without introducing the process of cross- multiplication. (YDS)

Discusses ways in which teachers can use the appealing study of quilts as a tool for teaching mathematics concepts and connecting multicultural history, literacy, and art. (Author/NB)

Describes how Thales, one of the Seven Sages of ancient times, used shadows and similar triangles to measure the heights of the pyramids. Includes activities on surveying. (YDS)

Describes an activity in which students demonstrate through a variety of creative mathematical analogies just how big Bill Gates's fortune is. (YDS)