Engage: Introduce the day's activity by showing a Geoboard to students.
Explain that this math tool can be used to show many shapes by carefully placing rubber bands around the pegs. Demonstrate and state the expectations for using this new tool with students.
Explore: Assign partner pairs, distribute Geoboards and rubber bands, and allow students to briefly
explore using the Geoboard.
Explain: The students will investigate a problem that involves
identifying plane shapes. Problem  "During story time, Brandon's teacher
told the children to sit on the floor. The children were to form
a shape that has three straight sides and three corners.
How can Brandon and his classmates figure out what shape
they are to sit in?" Introduce the problem, then have children do
the activity to solve the problem. Distribute Geoboards, rubber
bands, and Shape Recording Sheets (BLM 7). Instruct children to use
the rubber bands to make a shape that has four straight sides of equal
length and four corners. Tell children to count how many units each side
is to be sure they are equal. Guide children to identify the shape as
a square. Ask: "Is this the shape that the children are to sit in?"
Have children write "square"on their recording sheet and record
the number of sides and corners this shape has. Repeat this activity
for a rectangle and a triangle. After each shape has been made,
ask: "Is this the shape that the children are to sit in?"
Elaborate: Have children look at their Shape Recording Sheets (BLM 7).
Ask: "How many corners does a square have? How many sides?" Repeat
for triangles and rectangles. Have children compare and contrast two shapes.
For example, ask: "How is a square the same as a rectangle? How is a square
different from a rectangle?" Repeat with other shapes.
Evaluate: With children, reread the problem. Then have the students to
label on their recording sheet the shape that matches the description
given by the teacher to Brandon's class. For further evaluation,
have children draw a picture consisting of only squares, rectangles,
and triangles. Instruct children to label each shape in their drawing
and describe each shape.

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