They organize and record solutions and use measuring, counting, addition to find the total number of people. Cranberry Estimation Second-graders in Massachusetts estimate the number of scoops of cranberries that will fit in a jar. They report, graph, and discuss group estimates with the class as the concepts of range, mode, and median emerge. A third-grade class that has been studying the Oregon Trail explores estimation by figuring out how many buffalo would fit in their classroom and on their playground. Students develop number sense as they think about the reasonableness of estimates and use a referent to adjust their estimates.
Students mark their estimates on a number line and justify their estimates verbally and in writing.
Solving The half-hour program includes 13 classroom excerpts from the content standards lessons which illustrate students investigating and learning mathematics through problem solving. Teachers share their approaches and observations. The half-hour program includes 18 classroom excerpts from the content standards lessons which show students representing, discussing, reading, writing, and listening as vital parts of learning and using mathematics. It shows how communication fosters an understanding of mathematical ideas and the language of mathematics. The half-hour program includes 16 classroom excerpts from the content standards lessons which illustrate the central role of reasoning in mathematics.