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Mathematical Notation
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1.

## Angle Measurement [electronic resource]

Reviews mathematical notation for angle measurement and describes angles in terms of the amount of turn. Uses reasoning to determine the measures of angles in polygons based on the idea that there are 360 degrees in a complete turn. Presents the relationships among angles within shapes and generalizes a formula for finding the sum of the angles in any n-gon. Use activities based on GeoLogo to explore the differences among interior, exterior, and central angles.
Online
2002
2.

## Place Value [electronic resource]

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
3.

## Inventing Notations [electronic resource]

Demonstrates how to foster and appreciate students' notations for their richness and creativity, and looks at some of the possibilities that early work on problems that engage students in creating notation systems might open up for students as they move on toward algebra.
Online
2000