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ShapeTool
Geometry

Shape Tool

Pre-K-2, 3-5, 6-8
This tool allows you to create any geometric shape imaginable. Squares, triangles, rhombi, trapezoids and hexagons can be created, colored, enlarged, shrunk, rotated, reflected, sliced, and glued together.
TrigonometricGraphing
Algebra

Trigonometric Graphing

9-12
Explore the amplitude, period, and phase shift by examining the graphs of various trigonometric functions.
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Algebra

Join the Club: Identifying and Combining Like Terms

6-8

In this lesson, students learn the definition of like terms and gain practice in identifying key features to sort and combine them. Most middle school students are adept at recognizing the nuances of dress and manner that identify groups and cliques among their peers. This lesson applies the observation and sorting skills that students already possess to the important task of identifying and combining like terms. Students will play the game Ker-Splash and derive rules for working with like terms. 

 

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Number and Operations

Welcome to the Aquarium: Planning a Classroom Aquarium to Practice Decimal Operations

3-5
Students compute with whole numbers and and decimals as they make recommendations for buying an aquarium for the class. Students research the various materials needed for the aquarium and make plans based on their findings. They solve the problem while working within a budget. 
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Number and Operations

What's the (Decimal) Point?: Using Models to Understand Decimal Place Value

3-5
In this lesson, students apply their knowledge of whole number place value to decimal place value by using different blocks to represent one whole. By using blocks other than the unit cube to represent one whole, decimal place value can be explored and understood in a concrete fashion.
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Data Analysis and Probability

Running with Dinosaurs: Computing Running Rates Using Body Measurements, Footprints, and Algebra

3-5, 6-8
Studying the behavior and motion of dinosaurs is obviously a challenge since these creatures are extinct. If researchers wish to examine the running velocity of a dinosaur, they must instead consider other evidence of dinosaur motion and make an indirect estimate. In this lesson, students will play the role of researchers who field test the Alexander Formula—a formula that uses paleontology data to estimate dinosaur running velocities. Students will serve as human analogues, making measurements on themselves, computing predicted running velocities using the Alexander Formula, and calculating their actual running velocities. They will then evaluate the accuracy of the formula by comparing estimated and actual running velocities for the class. 
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Algebra

The Crow and the Pitcher: Investigating Linear Functions Using a Literature-Based Model

6-8
The lesson is based upon Aesop’s fable, “The Crow and the Pitcher,” and involves students making predictions and conducting experiments to determine how many pebbles the crow would need to add to the pitcher in order to bring the water to drinking height. In the course of the investigation, students gain a real-world understanding of linear functions and such concepts as slope, y-intercept, domain, and range.  
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Number and Operations

Drop Zone: Adding Fractions with Like and Unlike Denominators Utilizing Strategy

6-8
In this lesson, students will play card and computer games by adding fractions to make 1. Students will determine how the fractions are related, by first determining what they have and then how much more is needed. Through different interactive games, students will utilize their skills and build upon them to expand their understanding of fractions. Students will be able to determine common denominators and other strategies to add fractions with like and unlike denominators.
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Number and Operations

Chip Trading: Practicing Single-Digit Addition with Colored Chips Representing Ones, Tens, and Hundreds

Pre-K-2, 3-5
This kinesthetic lesson involves using models to practice regrouping and to reinforce place value understanding. Students work together to play games involving bases 10 and 5. Students will also interpret models as numbers. 
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Number and Operations

''Ten''ding the Herd: Counting Large Numbers by Tens and Ones

Pre-K-2
In this lesson, students work at stations where they practice counting large numbers by grouping herds of cows into tens and leftover ones, developing a deeper understanding of place value. The activities involve the use of manipulatives, ten-frames, and the Illuminations online activity Grouping and Grazing.