Side Lengths and Number of Tiles

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Presentation transcript:

Side Lengths and Number of Tiles Lesson 4.4:

Products in an Array How many rows of circles do you see? How many circles are in each row? Write two multiplication sentences that can be used to find the total number of circles. 5 × 3 = 15 and 3 × 5 = 15

Products in an Array How many rows of circles do you see? How many circles are in each row? Write two multiplication sentences that can be used to find the total number of circles.

Count the Square Units How many square units are in the rectangle? How many tiles were used to cover the rectangle? Ask the same questions about each…… Do the four rectangles look the same? What do the rectangles have in common. They are each made up of 8 square units. 8 x 1 1 x 8 2 x 4 4 x 2

Application Problem Mara uses 15 square-centimeter tiles to make a rectangle. Ashton uses 9 square-centimeter tiles to make a rectangle. a. Draw what Mara’s and Ashton’s rectangles might look like. b. Whose rectangle has a bigger area? How do you know?

Concept Development Pass out 15 square-inch tiles to each student. These tiles are square…? Inches Use the tiles to make a 3 by 5 array. Push the tiles together to form a rectangle with no gaps or overlaps. What is the area of your rectangle? 15 square inches I see your squares are nicely arranged to form a rectangle. What about these?

Concept Development I used 15 square-inch tiles to make both of these rectangles. Talk to a partner. Is the area of both rectangles 15 square inches? Why is it important to avoid gaps or overlaps when we measure area? If there are gaps or overlaps the amount of space the rectangle takes up changes. The square unit would be wrong since some area is taken away if there are overlaps or some is added if there are gaps.

Concept Development Use your ruler to measure across the top of your rectangle in inches. What is the length of this side? How many tiles are on this side? Use your ruler to measure the shorter side of the rectangle in inches. What is the length of this side? 3 inches 3 tiles

Concept Development What is the relationship between the number of tiles on a side and the side length of the rectangle? They’re the same! What do you notice about the lengths of the opposite sides of the rectangles? They are equal. Trace the rectangle on your board, then remove the tiles and label the side lengths. Now write the area inside the rectangle. What are the units for the side lengths? What are the units for the area? Talk to a partner, why are the units different for side lengths and area?

Concept Development The unit for side lengths is inches because we used a ruler to measure the length of the side in inches. For area, the unit is square inches because we counted the number of square-inch tiles that we used to make the rectangle. Inches are used to measure lengths, like the side lengths, and square inches are used to measure the amount of flat space a figure takes up, which is the area.

Concept Development Exchange square-inch tiles for square-centimeter tiles. These tiles are square… Use them to make a rectangle with side lengths of 5 centimeters and 4 centimeters. Tell your partner how many tiles you’ll count to make each side. I’ll make one side with 5 tiles and the other with 4 tiles. Opposite sides are the same, remember? Draw your rectangle in your notebook. Label the side lengths.

Concept Development How many fives did you make? Why? What is the total of 4 fives? Skip-count your fives to find the total area of the rectangle. What is the total area? 20 square centimeters! What is the relationship between the side lengths and area? If you multiply 5 times 4 then you get 20.

Concept Development Build a rectangle with side lengths of 3 centimeters and 6 centimeters. Use your ruler to measure across the top of your rectangle in inches. What is the length of this side? How many tiles are on this side? Use your ruler to measure the shorter side of the rectangle in inches. What is the length of this side? Draw your rectangle in your notebook. Label the side lengths. What is the area? What is the relationship between the side lengths and area?

Concept Development This time, the area is 16 square centimeters. What could be the length of the top? What could be the length of the sides? What is the relationship between the number of tiles on a side and the side length of the rectangle? Does everyone have the same rectangle? Why? Why not? Explain.