Illustrative Mathematics
Shortest Line Segment from a Point P to a Line L
One of the hardest skills for many young geometers to grasp is to move beyond just declaring obvious things true, and really returning to fundamental principles for proof. This brief exercise stretches those proving muscles as the class...
Illustrative Mathematics
Right Triangles Inscribed in Circles II
So many times the characteristics of triangles are presented as a vocabulary-type of lesson, but in this activity they are key to unraveling a proof. A unique attack on proving that an inscribed angle that subtends a diameter must be a...
Illustrative Mathematics
A Midpoint Miracle
Young geometers develop one of the fundamental properties of quadrilaterals (connecting side midpoints gives a parallelogram) in this short but thought-provoking exercise. Using a combination of hands-on techniques and abstract algebraic...
EngageNY
Tangent Segments
What's so special about tangents? Learners first explore how if a circle is tangent to both rays of an angle, then its center is on the angle bisector. They then complete a set of exercises designed to explore further properties and...
Radford University
Finding a Location for Your Kitchen Island
Where is the best place to work? Small groups map out a kitchen on a coordinate plane and find the centers of the work triangle to find the best place to install an island. The teams use algebraic methods to locate the center by finding...
Curated OER
Associative Property
For this associative property worksheet, students solve 10 different problems that include using the associative property to solve each one. First, they rewrite each equation by using the associative property. Then, students solve each...
Curated OER
Counting on to add
A cute little frog helps learners hop from number to number on the number line as they count on to add. They use the commutative property of addition to add the same numbers two different ways. A cute, simple, and potentially helpful...
American Chemical Society
Investigating the Line
Note that this activity is best paired with the preceding activity in the unit. In that activity, elementary physical scientists observed that the color coating of M&Ms® candies do not mix when dissolved off of the chocolate surface....
K-5 Math Teaching Resources
5x5 Geoboard Paper
Geoboards can take up a lot of space in the classroom; instead use this 5x5 geoboard paper! Six geoboards and lines for writing are included in this multi-use printable and template.
Curated OER
Notes Unit 1: Art Fundamentals
Here is a guide for your middle schoolers to use while you are providing a lecture on the basics of art. They use this worksheet to aid them as they take notes on the purpose of art, art elements, properties of art, and art principles....
Curated OER
The Shape Show
Define plane shapes by their properties, then use this game to reinforce those skills. Learners use given properties as clues to determine each shape. They work to name ten different shapes, six of which are polygons.
Curated OER
Magnetism
All phenomena concerning magnets, their field lines and impact on objects are covered. The trivia surrounding field lines and the earth, electric charges, repulsion and attraction is plentiful. The slide show continues after twenty...
Curated OER
Isosceles Triangles
In need of a fun way to define an isosceles triangle? This activity has learners fold a paper in half and then cut it to create an isosceles triangle. They determine the line of symmetry by folding the triangle in half and then use the...
Baylor College
What Makes Water Special?
Get close up and personal with a drop of water to discover how the polarity of its molecules affect its behavior. Elementary hydrologists split and combine water droplets, and also compare them to drops of oil. Much neater than placing a...
Baylor College
What Dissolves in Water?
One of water's claims to fame is as the universal solvent. Young physical scientists experiment to discover which materials dissolve in this special compound. You could never be more prepared for teaching this lesson plan than by using...
Illustrative Mathematics
Tangent to a Circle From a Point
Learners see application of construction techniques in a short but sophisticated problem. Combining the properties of inscribed triangles with tangent lines and radii makes a nice bridge between units, a way of using information about...
Curated OER
Concurrent Lines in Triangles
Students explore the concept of concurrent lines in triangles. In this concurrent lines in triangles lesson, students work in groups to investigate properties of concurrent lines in acute, right, and obtuse triangles. Students use a...
Curated OER
Properties of Special Parallelograms
Students identify properties of trapezoids. For this geometry lesson, students are put into groups and use computer programs to analyze polygons. They drag and move the shapes around as they make predictions.
Curated OER
Simson Line
Stuednts identify triangles for the Simson Line. In this geometry lesson, students solve triangular problems using the properties of triangles.They differentiate between the height, congruency and similarity.
Curated OER
Transitive Property of Inequality
For this transitive property worksheet, students use the transitive property to help them solve the riddle for the order of men and where they stand. Students solve the riddle for 10 men.
Curated OER
Logarithms and their Properties
In this logarithm activity, students explore the properties of logarithms. Explanations and examples are provided. This three-page activity contains ten logarithm problems to solve.
Curated OER
Complex Analysis: Examples of Contour Integration
In this contour integration worksheet, students evaluate an equation, sketch the contour and evaluate the integral. This two-page worksheet contains approximately eight problems.
Curated OER
Secant Line Approximation of the Tangent Line
Students perform operation with secant and tangent lines. In this calculus lesson, students find the derivative and relate it to the slope of a line. They differentiate between secant and tangent as they intersect a circle, using Cabri.
Curated OER
Properties of Magnets
Second graders read and discuss the book "What Magnets Can Do." They recall the explanations of magnet, attract, repel, and magnetic poles from their reading. They work in pairs to discover the properties of magnets using a magnet and...