# 4.G The Geometry of Letters

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This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Letters can be thought of as geometric figures. How many line segments are needed to make the letter A? How many angles are there? Are they acute, obtu...

Material Type: Activity/Lab

Author: Illustrative Mathematics

# 4.G What's the Point?

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This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: The students in Ms. Sun's class were drawing geometric figures. First she asked them to draw some points, and then she asked them to draw all the line ...

Material Type: Activity/Lab

Author: Illustrative Mathematics

# 4th Grade: Spaghetti Tower Challenge

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Students will construct a tower as high as possible using spaghetti, lasagna noodles and marshmallows. Limited supplies of materials are available. Pieces of spaghetti can be broken into desired lengths.

Material Type: Activity/Lab

Authors: William Allred, Carrie Robledo

# Acute Angle

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An interactive applet and associated web page that demonstrate acute angles (those less than 90 deg). The applet presents an angle (initially acute) that the user can adjust by dragging the end points of the line segments forming the angle. As it changes it shows the angle measure and a message that indicate which type of angle it is. There a software 'detents' that make it easy capture exact angles such as 90 degrees and 180 degrees The message and angle measures can be turned off to facilitate classroom discussion. The text on the page has links to other pages defining each angle type in depth. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Author: John Page

# Angle Barrier Game

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Students work with a partner and sit opposite one another with a divider between them. Each student takes turns drawing and labeling angles in each space on their grids and give instructions to their partner on how to draw the angles to match the ones on his/her grid. Students use positional language to describe where to place the angles.

Material Type: Activity/Lab

Author: K-5 Math Teaching Resources

# Angle Classification

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This short video and interactive assessment activity is designed to give fourth graders an overview of classification of angles.

Material Type: Assessment, Interactive, Lecture

# Classify Angles

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This short video and interactive assessment activity is designed to give fourth graders an overview of angles.

Material Type: Assessment, Interactive, Lecture

# Constructing a 30 degree angle with compass and straightedge

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An interactive applet and associated web page that show how to construct a 30 degrees angle with a compass and straightedge. The animation can be single-stepped or run as a continuous movie. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Author: John Page

# Constructing a 45 degree angle with compass and straightedge

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An interactive applet and associated web page that show how to construct a 45 degrees angle with a compass and straightedge. The animation can be single-stepped or run as a continuous movie. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Author: John Page

# Constructing a 60 degree angle with compass and straightedge

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An interactive applet and associated web page that show how to construct a 60 degrees angle with a compass and straightedge. The animation can be single-stepped or run as a continuous movie. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Author: John Page

# Counting the Number of Perpendicular Lines

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This short video and interactive assessment activity is designed to teach fifth graders about counting the number of perpendicular lines.

Material Type: Assessment, Interactive, Lecture

# Determining Unknown Angles within Rectangles and Squares

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This short video and interactive assessment activity is designed to teach fifth graders about determining unknown angles within rectangles and squares.

Material Type: Assessment, Interactive, Lecture

# Elementary Math - Grade 3

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CK-12's Elementary Math Grade 3 is a series of videos and interactive videos designed to teach basic math concepts to 3rd graders. Concepts covered include Addition and Subtraction, Multiplication, Division, Place Value, Decimals, Time, Factors and Multiples, Money, Measurement, and Geometry.

Material Type: Activity/Lab, Interactive, Lecture

# G4 C8 Lesson- Lines and Angles

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In this lesson students explore lines and angles in the context of a scavenger hunt.

Material Type: Activity/Lab, Lesson Plan

Author: Drew Polly

# G4 C8 NC Lines and Angles

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In this lesson students explore lines and angles in the context of North Carolina.

Material Type: Activity/Lab, Lesson Plan

Author: Drew Polly

# G4M4: Angle Measure and Plane Figures

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G4M4: Angle Measure and Plane Figures. Contains 16 Lessons.

Material Type: Module

# Area Model for Division

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This is one possible method for using the area model for division. With this division strategy, students divide by breaking the dividend into its expanded form. Then, students use familiar multiplication facts to divide. It is suggested that this would be the first of three strategies for division (preceding partial quotients and the standard algorithm.

Material Type: Activity/Lab, Diagram/Illustration, Interactive, Teaching/Learning Strategy

Author: Dawne Coker