Lesson 18 of 18
Objective: SWBAT describe 2D shapes using defining attributes; SWBAT partition circles and rectangles into equal/unequal parts, halves, and fourths.
To begin this review lesson, I like to start with the video “Monster Math: Geometry”.
I like to use this video because it reviews some of the basic vocabulary terms for the geometry standards.
Once the video is complete, I write the vocabulary words on the board/chart paper: equal shares, unequal shares, halves, fourths, quarters, vertices, and straight lines.
I tell the students that in our lesson today, we are going to take an assessment on geometry. As a class we discuss and review the vocabulary terms. I have a student volunteer come to the board and draw a picture for each word.
I begin a systematic review of each of the 3 standards by beginning with defining attributes (1.G.A.1). To start this review, I hand out pattern blocks to students and we review the sides and vertices of each shape.
I then begin a review of the standard of composing and decomposing 2D shapes (1.G.A.2). I like to spend a little more time reviewing this standard because it can be a little more difficult for some students to understand and master. This standard can be difficult because it’s an abstract standard, the students have to be able to picture the composed or decomposed shape(s), and many of them have difficulty doing this. While I don't want to reteach the whole standard, I do want students to head into the assessment feeling confident and with their working memories jogged. To help, I like to continue to use the pattern blocks and start with a hexagon. I instruct the students to use trapezoids to make a hexagon. For those struggling students, I have them place the trapezoids on top of the hexagon to help with visualizing the shapes. I then have them use the rhombus shapes to make a hexagon, and then triangles.
In this picture, a student has successfully composed a hexagon using 2 trapezoids, 3 rhombuses, and 6 triangles.
For the final standard, of partitioning circles and rectangles (1.G.A.3), I like to do a quick review using play-doh. I like using play-doh because it’s a concrete item that can be used to divide wholes into halves and fourths. I instruct the students to make a pizza, or circle shape, out of their play-doh. I then have them divide it into 2 equal shares, or halves; and 4 equal shares, or fourths.
After reviewing the concepts, I distribute the Geometry Assessment_worksheet to each student and have them complete the test.