An interactive applet and associated web page that demonstrate the concept of complementary angles (angles that add to 90 degrees). The applet shows two angles. You can drag the endpoints of each angle and the other angle changes so that they always add to 90 degrees. They are drawn in such a way that it is visually obvious that together they form a right angle, although they are separate on the page. The angle measure readouts can be turned off for class discussions. 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.

Learn how to "gamify" your classroom for management and success for all learners.

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History shows that regulated hunting is the foundation of conservation in North America. Big game records books help document this history.
The Boone and Crockett Club began laying the foundations for its records program in 1902. Theodore Roosevelt was appointed chairman of the Club’s first records committee—a committee that was charged with developing a measuring and record keeping system for male, native North American big game trophies. In 1906 the Club published its book, Big Game Measurements. The stated purpose of this book was to put into practice a uniform standard of measurements of the large game of North America. Members were encouraged to record the measurements of the game they harvested and send the information in to the Club's secretary. The scoring system described in this book, which is different from the one used today, was devised by Club members Theodore Roosevelt, Caspar Whitney, and Archibald Rogers.

This short video and interactive assessment activity is designed to teach fourth graders about finding and completing the number patterns.

This short video and interactive assessment activity is designed to teach third graders about finding and completing the number patterns.

Complete the checklist for reading and colour as you go!

This would be great for over the summer break.

A pattern recognition game where players must drag the correct shape into the correct spot to complete the pattern.

This short video and interactive assessment activity is designed to teach fourth graders about completion of number patterns.

This short video and interactive assessment activity is designed to teach fourth graders about completing a decimal place value chart up to hundredths.

This short video and interactive assessment activity is designed to teach fourth graders about completing a decimal place value chart to tenths.

Students identify, explore and apply the elements of circle plot structures to their own stories by using graphic organizers, reading and writing stories, and using checklists to assess their work.

In the everyday electrical devices we use calculators, remote controls and cell phones a voltage source such as a battery is required to close the circuit and operate the device. In this hands-on activity, students use batteries, wires, small light bulbs and light bulb holders to learn the difference between an open circuit and a closed circuit, and understand that electric current only occurs in a closed circuit.

Hank continues our exploration of animal phyla with the more complexly organized annelida and arthropoda, and a biolography on insects.

By the end of the lesson, students will know the definition of a steward and will recognize that stewardship decisions require the consideration of multiple criteria.

This problem is intended to reinforce the geometric interpretation of distance between complex numbers and midpoints as modulus of the difference and average respectively.

Students learn about complex networks and how to represent them using graphs. They also learn that graph theory is a useful mathematical tool for studying complex networks in diverse applications of science and engineering, such as neural networks in the brain, biochemical reaction networks in cells, communication networks, such as the internet, and social networks. Topics covered include set theory, defining a graph, as well as defining the degree of a node and the degree distribution of a graph.

We visualize complex numbers in the same way we visualize an ordered pair on a plane.