4MA2

LO3

Perimeter and Area Staring Penelope and Arnie

Formative Assessment:

1. How does a farmer know how much fence to put around his pigpen?

2. How does a painter know how much paint to buy to paint a room?

3. Do you know the difference between area and perimeter?

4. Do you know how to calculate area and perimeter?

Instructional Strategies or Activities:

1. Draw an equilateral triangle on the board and label each side 10 ft. Write this sentence near the triangle: The perimeter of the triangle is 30 ft. Have students examine the drawing to determine the meaning of perimeter (the distance around the figure). Then have students generalize how to find the perimeter of any figure.

2. Introduce students to Penelope Pig by displaying the poster on a math bulletin board. Explain the meaning of a mnemonic device by reading the sentence about Penelope Pig to the students. Discuss with the students the problem found on the poster.

3. Have students recall the meaning and measurement needed for perimeter. Then ask students to generalize a field surrounded by a fence. Explain that the inside space, known as the area, can also be measured.

4. Have students give meaning of the word area as it is used in such phrases at the “art area”, “the wooded area”, or “the parking area”. Explain that area mean “the space inside a figure.”

5. Introduce students to Arnie the Alien by displaying the poster on the math bulletin board. Explain the meaning of a mnemonic device by reading the sentence about Arnie the Alien to the students. Discuss with the students the problem found on the poster.

Summative Assessment:

1. Have students write and solve their own area and perimeter word problem.

2. Students will write their own alliterated mnemonic device to help them remember the definition of area and perimeter.