# Area (or KEVA²) OBJECTIVE: Students will calculate the areas of rectangles with KEVA planks.

MATERIALS:

• 25 planks per student
• KEVA² Data Sheet per student

PROCEDURE:

1. Discuss the concept of area being the space inside a two-dimensional figure.

2. “Today we will be measuring with a unit of measurement that is uniform but not the standard, such as a cubic inch or square centimeter. We will be using a KEVA square as our unit for measuring area.”

3. Show the class a KEVA square. Show how you could measure the area of a table with the KEVA².

4. Have the students construct a square using planks that will have an area of 1 KEVA². Constructed on the flat or side edges, the KEVA² will be the space enclosed inside the planks. Always measure the area on the inside of the KEVA figure.

5. Have the students construct a rectangle with an area of 4 KEVA². How many planks were used? [8 or 10] Did everyone’s look the same? [No] Explain that rectangles can have different perimeters but equal areas or equal perimeters and different areas.

6. Write the formula for area on the board:

SxS=A

7. As a class, construct rectangles with areas of 2 KEVA², 3 KEVA² and 4 KEVA².

8. Have the students form small groups to construct as many rectangles as they can with areas of 6 KEVA², 8 KKEVA², 12 KEVA², 24 KEVA².

MATH EXTENSION: Students could also calculate the perimeter of each rectangle and try to see how many different perimeters they can form for each area.