1. Module 8 Lesson 1 & 2

2. Objectives Describe two-dimensional shapes based on attributes. Build, identify, and analyze two-dimensional shapes with specified attributes.

3. Sprint: Adding Across a Ten Sprint A: On your mark, get set, THINK! Sprint B: On your mark, get set, THINK!

4. Rename the Larger Unit I’m going to give you a number of ones. I want you to make as many tens as you can, and then tell me how many tens and ones. If there are no ones, then just say the tens. Ready? 10 ones = ____ ten. Say the number sentence. 100 ones = ____ tens 10 ones. Say the number sentence. 120 ones = ____ tens 10 ones. 140 ones 210 ones 250 ones 225 ones 381 ones 360 ones 306 ones

5. Application Problem Terrence is making shapes with 12 toothpicks. Using all of the toothpicks, create 3 different shapes he could make. How many other combinations can you find?

6. Concept Development Let’s look at this shape. How would you describe this shape without using it’s name? Good. If a figure has three corners, then it also has three angles. An angle is the figure formed where two sides meet. Watch as I mark the angles on the triangle. Although these shapes look different, all of them have some attributes, or characteristics, in common. What are they? All of these shapes have common attributes. They all have three straight sides and three angles.

7. Concept Development Now, let’s look at another shape. How would you describe this shape without using its name? Yes! Is there an angle here? It looks different. Let’s count the angels. I’m going to put my finger next to the first angle we count, and continue counting as we go around the shape. That way, we won’t count the same angle twice. Although these shapes look different, all of them have what attributes? All of these shapes have common attributes. They all have 4 straight sides and 4 angles.

8. Concept Development Now, let’s look at another shape. How would you describe this shape without using its name? Let’s count the angels. Although these shapes look different, all of them have what attributes? All of these shapes have common attributes. They all have 5 straight sides and 5 angles.

9. Concept Development Now, let’s look at another shape. How would you describe this shape without using its name? Let’s count the angels. Although these shapes look different, all of them have what attributes? All of these shapes have common attributes. They all have 6 straight sides and 6 angles.

10. Concept Development There are many shapes that have more than six sides or six angles. Now, it’s your turn to try and stump your partner. Build a shape with any number of sides or angles. Then, trade with your partner. See if you can count the number of sides and angles on your partner’s shape. If you agree, then make another shape. Tell your partner why you need to pay attention to more than how a shape looks when grouping shapes. Now that we have done so much work with different shapes, how would you describe an angle? Talk to your partner. The angle is the figure formed where two sides meet.

11. Application Problem How many triangles can you find? Hint: If you only found 10, keep looking!

12. Vocabulary Angle: the figure formed where two sides meet. Attributes: Characteristics of an object such as number of sides, angles, or faces. Polygon: A closed figure with three or more straight sides. Every side meets exactly two other sides at the corners. A polygon always has the same number of angles as sides. Triangle: A three-sided polygon with three angles. Quadrilateral: A four-sided polygon with four angles. Pentagon: A five-sided polygon with five angles. Hexagon: A six-sided polygon with six angles.

13. Complete That Shape Now, we’re going to play Complete That Shape. I am going to draw part of a shape on the board, like this. Then, I will say, “Complete that pentagon.” With your toothpicks, start with the part I have drawn, and add more sides, corners, and angles until you have built the entire shape. Let’s play. Complete that pentagon! Watch How many sides and angles do you have? Complete that quadrilateral! How many sides and angles do you have?

14. Complete That Shape Complete that triangle! How many sides and angles do you have? Complete that hexagon! How many sides and angles do you have? Complete that quadrilateral! How many sides and angles do you have? Complete that triangle! How many sides and angles do you have? Complete that pentagon! How many sides and angles do you have?

15. Let’s Check for Understanding Could a polygon have only two angles? Why or why not? Polygons have many angles. Poly- means many, and -gon means angle. What is the smallest number of angles a polygon can have? If you closed your eyes and felt a shape with five sides and five corners, could you name it? What would you name it? Picture a square in your head. Could you describe a square with another name? What would you name it? Picture a three-sides shape in your head. Could you describe the polygon with another name? What would you name it? What would you name a 6-sided shape that has 6 angles?