The second poster should say Similar and the third should say Neither Congruent or Similar. On one, write Congruent in large letters. Put three big different colored posters on the ground. Although these shapes are very different in size, they have the same shape. One should be huge and the other very small. Similar is when two objects are the same shape but different sizes. If students are to understand congruence, then they must understand the term similar. It is best to have kids make the sign in front of their chest so kids aren’t swayed by their classmates’ responses. An easy way to check for understanding is to have students give a thumbs up sign if the shapes are congruent and thumbs down if it is not. The different positions of the shapes does not make objects not congruent. It is also important for students to understand that shapes can be congruent if one is upside down and the other is right side up. Are these pencils the identical? Yes, they are congruent because they are the same shape and size. Then, hold up two pencils that look exactly the same. Ask students are these pencils identical? They are not congruent because they are different sizes. To illustrate this, hold up two different colored pencils that are the same kind but different lengths. In other words, it is impossible to tell two congruent items apart because they are exactly the same. Two shapes that are congruent are identical. For shapes, it is an object with the same shape and size. What is congruence? In simple terms, it means equal. Finally, they can hunt for congruent shapes in the classroom and use congruent shapes to make an artistic masterpiece. Then, using everyday shapes kids can categorize congruent, similar and unlike objects. Through these lessons, they can identify congruent objects and define congruency. These congruency activities for third grade help kids become active learners.
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