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### Squares, Diagonals, and Square Roots

6-8

Students explore the relationship between the lengths of the sides and diagonals of a square. Students will use their discoveries to predict the diagonal length of any square. ### Ten Frame

Pre-K-2

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

Pre-K-2

The four games that can be played with
this applet help to develop counting and addition skills.### Making a Baseball Lineup: Using Baseball Statistics to Create a Baseball Game Simulation

3-5

In this activity students will analyze data and select fictional
baseball players based on player statistics. They will apply concepts of
probability to choose the order of batters on their team. After creating a
spinner for each player to represent the statistics, they use the spinners to
play a simulated baseball game.### Tallies, Ten Frames, and Baseball Games

Pre-K-2

Your home team can set the stage for students to make math connections. Students will record wins and losses in different formats to discover connections between many of the concepts taught earlier in the year. This lesson will provide daily and weekly practice with patterns, addition and subtraction equations, number models and math communication.### It's Not Heavy, It's Your Grade

6-8

In baseball, a batter's slugging average is weighted according to the number of bases he gets. To calculate the average height of a team, each height must be weighted according to how many players are that tall. This lesson introduces students to weighted averages by looking at their own grades.### Pedal Power

9-12

In this lesson, students investigate slope as a rate of change. Students compare, contrast, and make conjectures based on distance-time graphs for three bicyclists climbing to the top of a mountain. ### Euler Diagrams and Logic

9-12

This lesson focuses on using Euler diagrams to explore direct, indirect,
and transitive reasoning. It was adapted from the article "A Visual
Approach to Deductive Reasoning" by Frances Van Dyke, which appeared in
the September 1995 issue of the *Mathematics Teacher*journal.

### Modeling Orbital Debris Problems

9-12

In this lesson, students examine the problem of space pollution caused by human-made debris in orbit to develop an understanding of functions and modeling. It allows the students an opportunity to use spreadsheets, graphing calculators, and computer graphing utilities.