Illustrative Mathematics
Similar Triangles
Proving triangles are similar is often an exercise in applying one of the many theorems young geometers memorize, like the AA similarity criteria. But proving that the criteria themselves are valid from basic principles is a great...
EngageNY
Basic Properties of Similarity
Does the symmetry and transitive property apply to similarity? The 10th segment in a series of 16 presents the class with a group of explorations. The explorations have pairs show that similarity is both symmetrical and transitive. It...
Core Knowledge Foundation
Different Lands, Similar Stories Tell It Again!™ Read-Aloud Anthology
A read-aloud anthology highlights how one story differs depending on where it comes from. Scholars listen carefully to familiar and new stories, participate in discussions, and complete word work practice. Extensions for each lesson...
Curated OER
How We Are Alike And Different
Students engage in a lesson that is concerned with the similarities and differences as part of knowing other children. They use examples of different drinks to illustrate the differences or similarities that are present in the student...
Curated OER
Similar Shapes
In geometry, similar and congruent shapes are often confused. Shapes that are similar are the same shape, but a different size. This activity gives young learners some practice in identifying similar shapes. There are five polygons...
Dorling Kindersley
Which flag is different?
Little ones build visual discrimination skills and fine motor control, while identifying differences. They circle the flag that is different, then they draw a flag that looks different than the others and the same as the others shown....
Curated OER
Same and Different Through Music and Art
This lesson is intended for a music class but would be a great way to teach compare and contrast to any class. Kindergarteners dance the Hokey Pokey to four different styles of music and examine two paintings of Humpty Dumpty, then...
Curated OER
Similarity: Instructional
In this similarity learning exercise, students solve and complete 7 different problems that include determining various dimensions of mirrors shown. First, they find the length of the diagonal of the large mirror in the diagram. Then,...
Curated OER
Dilations and Similarity
In this dilations and similarity instructional activity, pupils solve 10 different problems that include various dilations. First, they determine the scale factor of dilations found in the illustrated graphs. Then, everyone determines...
Roy Rosenzweig Center for History and New Media
Differences Among Colonial Regions
Classes look at and analyze primary source images to explore the differences between the colonial regions during the Revolutionary era. They break into groups to tackle each region and then present their findings to the class. A final...
Missouri Department of Elementary
Same and Different
A take on "If You're Happy and You Know It" opens a lesson about similarities and differences. Scholars speak in-depth on the unique characteristics that make up their classroom. The teacher or counselor records responses. Class members...
West Contra Costa Unified School District
Investigating Similar Triangles
Let your use of the resource be in proportion to its usefulness. Pupils investigate similar triangles by measuring side lengths and considering given angle measures. The results of the investigation help develop generalizations about...
EngageNY
Are All Parabolas Similar?
Congruence and similarity apply to functions as well as polygons. Learners examine the effects of transformations on the shape of parabolas. They determine the transformation(s) that produce similar and congruent functions.
EngageNY
Similarity
Use the coordinate plane to show two figures are similar. The lesson incorporates congruence transformations and dilations to move a figure on to another figure. Pupils determine that if a similarity transformation exists between two...
West Contra Costa Unified School District
Congruent and Similar Polygons
What's similar about congruent and similar polygons? Young mathematicians first measure the side lengths and angles of given figures. They use these measurements to determine relationships between side lengths and angles of congruent and...
Education Development Center
Similar Triangles
Model geometric concepts through a hands-on approach. Learners apply similar triangle relationships to solve for an unknown side length. Before they find the solution, they describe the transformation to help identify corresponding sides.
Charleston School District
Identifying Series and Determining Congruence or Similarity
Learners consider a set of questions to determine a series of transformations that will move one figure to another. Once the series is determined, the pupil then determines whether the pre-image and image are either congruent or similar.
Concord Consortium
Symbolic Similarity
How many things does one transformation tell you? Learners compare and contrast the graphs of different parent functions with the same transformation. Using a rational and absolute value function, pupils identify key features of their...
Flipped Math
Prove Triangles Similar
Show more than one way to prove similarity. Scholars learn three different methods to show two triangles are similar, Angle-Angle, Side-Side-Side, and Side-Angle-Side. Pupils practice applying these methods to determine whether two given...
Teaching Tolerance
Using Photographs to Teach Social Justice | Affirming Our Commonalities and Differences
Photos can challenge stereotypes. To gain an understanding of the big picture, groups examine a series of photographs and analyze how a photographer's choices can shape a viewer's reaction to an image. For the first set of photographs,...
Curated OER
Claim It: Differences and Similarities, Creating a Climate of Inclusion
Students explore the concept of diversity. In this inclusion lesson, students discuss similarities and differences among students in their class, identify the benefits of diversity, and write personal commitment statements regarding...
Curated OER
Same or Different
It is really important for learners to know when objects are the same and when they are different. Here are five rows of objects, they circle the objects in each row that are the same or different from the first object in that row.
Curated OER
Which is Different?
In this which is different worksheet, students will choose the different object from a row of 4 similar objects. Students will circle the figure that is not like the others.
Curated OER
Different
Sometimes, we forget how much there is to learn for a preschooler. This simple learning exercise allows them to practice differentiating animals that are the same, from animals that are different. They must circle the animal that doesn't...