Practice decomposing irregular shapes to find their area. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints. CCSS.Math.Content.3.MD.C.7.d Recognize area as additive.

Practice decomposing figures into rectangles to find area. Some figures are on grids. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints. CCSS.Math.Content.3.MD.C.7.d...

This is a site for students and teachers of all grade levels. If you are looking for math tables, general information about math topics, or you would like to ask a question, this is the site to visit.

Students use the Geoboard App to measure arcs, line segments, area, and perimeter, as well as rotate, reflect, and translate objects.

A review of the 13 books of Euclid's "Elements" text can be found here. Each of the chapters are broken down into definitions, propositions, and common notations that are used throughout this overview.

This site includes two first grade math vocabulary lesson plans: one for measurement terms and time and money, and another for geometry terms

This geometry resource investigates types of angles. Definitions, detailed examples, and practice problems are included.

In this activity, students use measuring tools and calculators to make half-sized drawings of themselves.

Surveyors describe land parcels with distance and angle measurements, often given as compass headings. Once the boundaries of the land parcel are described, the surveyor can calculate the area of the land. This activity uses Cabri Jr....

The purpose of this lesson is to help students apply math concepts concerning similar triangles and trigonometric functions to real life situations. The students learn how to take these concepts and use them to find measurements of...

This upper elementary and middle school lesson plan introduces the concept of acute, obtuse and right angles. Also, as the lesson proceeds vertical, adjacent, alternate interior and alternate exterior angles are explored. Plenty of...

Forest industry professionals make measurements in their work using tools including the Clinometer and the Biltmore Stick. These tools are based on the concepts of similar triangles and trigonometric ratios in a right triangle. This...

Students explore polyhedron's through technology and paper/ pencil constructions.

This activity is used to discover that the sum of the measures of the triangle angles is constant and to discover ways of proving the theorem listed in the activity.

A concise tool for assessing a variety of math concepts including measurement, algebra, number sense, and data. Assessment is scored online immediately. An excellent tool for quick assessment.

Surface area is defined and how to determine the surface area of a prism is explored.

Explore opposite angles by chosing the appropriate angle for the missing degree of measure.

A "convention" is "just the way a thing is done!". This reference material lists some common conventions (notational assumptions) for geometry and trigonometry.

This lesson allows middle schoolers to discover the number Pi. By measuring real life objects, students will get to see where the number Pi comes from as well as how the circumference formula is derived.This lesson plan was created as a...

Use this activity to teach students to represent numbers in scientific notation, and use geometry to solve problems related to three-dimensional figures. Explore distance and capacity problems about planets in the solar system. The...

Can there be a connection between map making and math? Explore the mathematics of cartography in this resource that integrates web-based instruction, mathematical problem solving, geometry, history, and art. Interesting information and...

In this activity, students use the drawing and measurement tools of Cabri Jr. to blend coordinate geometry with drawing tools. They visualize symmetry and reflect a point across the y-axis.

Use prior knowledge of a rectangular prism to determine the formula of a cylinder. Check for understanding with the assessment at then end of lesson.

This video geometry lesson [6:14] explains the concept of perimeter and has varied exercises for students to practice.