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Jen Saul combines think time, partner discussions, and an emphasis on students' personal strategies to build confidence through mental math. Students use and discuss the strategies of "decomposing," "splitting," and "jumps of ten."

An interactive applet and associated web page showing how to find the area and perimeter of a trapezoid from the coordinates of its vertices. The trapezoid can be either parallel to the axes or rotated. The grid and coordinates can be turned on and off. The area and perimeter calculation can be turned off to permit class exercises and then turned back on the verify the answers. The applet can be printed as it appears on the screen to make handouts. The web page has a full description of the method for determining area and perimeter, a worked example and has links to other pages relating to coordinate geometry. 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.

An interactive applet and associated web page that introduce the concept of a triangle. The applet shows a triangle where the user can drag the vertices to reshape it. As it is being dragged a base and altitude are shown continuously changing. Demonstrates that the altitude may require the base to be extended. The text on the page lists the properties of a triangle and lists the various triangle types, with links to a definition of each. 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.

The applet shows a triangle which the user can resize by dragging any of its vertices. It shows the three perpendicular bisectors of the sides and the point where they intersect - the circumcenter. These track the changes in the triangle in real time. It shows that the circumcenter may lie outside the triangle. The associated web page describes the properties of the circumcenter and points out that it the center of the triangle's circumcircle. 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.

An interactive applet and associated web page that demonstrate the exterior angles of a triangle. The applet shows a triangle where the user can drag any vertex to reshape it. The exterior angles are shown and a running calculation shows that no matter how you change the triangle, the exterior angles always add up to 360 degrees An exterior angle is equal to the sum of the opposite interior angles 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.

An interactive applet and associated web page that demonstrate the concept of triangle inequality. The applet shows a triangle where the vertices can be dragged to reshape the triangle It shows that no matter what you do, the longest side is always shorter than the sum of the other two. 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.

An interactive applet and associated web page that demonstrate that in similar triangles, the ratio of their areas is the square of the ratio of the sides. As you drag one triangle to resize it, it remains similar to another and the ratios of sides and areas is calculated as you drag. One can be seen to be the square of the other at all times. A slight 'snap-to' effect allows easy selection of integer ratios (2:4 etc). 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 reference book project at http://www.mathopenref.com.

An interactive applet and associated web page that illustrate the triangles that can be drawn inside a polygon. The applet has a pentagon with the triangles drawn. The user can change the number of sides, and switch between regular / irregular. The vertices are draggable. The text on the page discusses the uses of these triangles. 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.

Book description: This is a text on elementary trigonometry, designed for students who have completed courses in high-school algebra and geometry. Though designed for college students, it could also be used in high schools. The traditional topics are covered, but a more geometrical approach is taken than usual. Also, some numerical methods (e.g. the secant method for solving trigonometric equations) are discussed. A brief tutorial on using Gnuplot to graph trigonometric functions is included.

There are 495 exercises in the book, with answers and hints to selected exercises.

Students will create a route for their ozobot to travel using parallel, perpendicular and intersecting lines. They will also create a "trap" to catch a turkey, or other animal, on the route.

The purpose of Unified Arabic Braille Portal is to present the Arabic Braille table in math and science signs/ symbols, as well as to develop the first eight-dots Arabic computer braille table to take benefit of its multiple features, such as writing or reading a single code in a single cell and supporting some computer signs.

This guide outlines various OER resources available to utilize the Area Model in the Mathematics classroom. The guide is intended to help Adult Education and Community College Instructors learn and utilize more visual approaches in the math classroom. However, many of the resources are Common Core aligned, and are therefore appropriate for k-12 use as well.

Students in this lesson will learn about, connect and apply the use of area to a real-world problem—creating a planting guide for the garden. Students will determine the square footage of the garden and use this information, along with a planting chart to create their own plan.

In this lesson, students use a base number (1,000, 100, or 20) to compare the numbers of extinct, endangered, and vulnerable species and consider how their actions can help protect animals and plants.

Step 1 - Inquire: Students estimate the number of living things in a group to get a sense of the large number of species in the world.

Step 2 - Investigate: Students write numbers to represent the number of living things on the IUCN's Red List.

Step 3 - Inspire: Students compare and contrast numbers to compare groups of living things, reflecting on how to help living things in their community.

In this lesson, students will take temperature readings in the outdoor classroom, compare them to data from a graph, and discuss the numerical differences between the readings and the data.

Students will gather information and data about vaccine information. They will use this information to argue whether or not vaccinations should be mandatory, culminating in a summative assessment in the form of a debate and a reflection on the information gathered.

This is a fun hands on Valentine activity to use with  K-1 age students to help them understand bar graphs and how these typ of graphs represent real numbers.