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### Computing Pi

6-8, 9-12

Compare two methods for computing pi in this applet.### Free Ride

6-8, 9-12

Explore fractions using the context of a bicycle and gear ratios.### Graph Creator

6-8, 9-12

Use this vertex-edge tool to create graphs and
explore them. Investigate ideas such as planar graphs, complete graphs,
minimum-cost spanning trees, and Euler and Hamiltonian paths.### Five Frame

Pre-K-2

The four games that can be played with
this applet help to develop counting and addition skills.### Ten Frame

Pre-K-2

The four games that can be played with this applet help to develop counting and addition skills.### How Many Under the Shell?

Pre-K-2

Use this tool to practice addition and subtraction with Okta, the octopus.### Area Tool

6-8

Use this tool to determine how the length of the base and the height of a
triangle, parallelogram, or trapezoid can be used to determine its area.### Compound Interest Simulator

9-12

This applet will allow you to investigate savings
account earnings, credit card debt, and a stock market simulation.### Primary Krypto

Pre-K-2, 3-5, 6-8

Combine five
number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a
"target" number.