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Teachers — Training of
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Numeration
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1.

## Place-Value Centers [electronic resource]

First-graders develop an understanding of the numeration system by relating counting, grouping, and place-value concepts. Activities include measuring with Unifix cubes and using base-ten blocks. Covers the following NCTM standards: number sense and numeration, measurement, connections.
Online
1997
2.

## Pumpkin Seeds [electronic resource]

A grade 1-2 class, working in groups, develops their sense of larger numbers by estimating and counting the number of seeds in pumpkins. Covers the following NCTM standards: number sense and numeration, estimation, communication, and reasoning.
Online
1997
3.

## Cubes and Containers [electronic resource]

Kindergarteners sort Unifix cubes in various ways, focusing on the properties of the objects' similarities and differences. By creating patterns, children develop an early understanding of geometry. Covers the following NCTM standards: concepts of whole number operations, number sense and numeration, communication, and reasoning.
Online
1997
4.

## Number Sets, Infinity, and Zero [electronic resource]

Continues examining the number line and the relationships among sets of numbers that make up the real number system. Explores which operations and properties hold true for each of the sets. Considers the magnitude of these infinite sets to reveal how infinity comes in more than one size. Examines place value and the significance of zero in a place value system.
Online
2003