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Place Value (Mathematics)
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1.

Place-Value Centers [electronic resource]

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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.

Number Sets, Infinity, and Zero [electronic resource]

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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
3.

Place Value [electronic resource]

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Looks at place value systems based on numbers other than ten. Examines the base two numbers and identifies uses for base two numbers in computers. Explore exponents and relates them to logarithms. Examine the use of scientific notation to represent numbers with very large or very small magnitude. Interprets whole numbers, common fractions, and decimals in base four.
Online
2003