Finding Area and Dimensions of Rectangles

The video tutorial teaches third graders how to calculate the missing side length of a rectangle by dividing its area. It begins with a practical problem of painting stripes on a cafeteria wall and explains the concept of area using rectangles. The tutorial addresses common misconceptions about area and side lengths, then solves the wall problem by calculating the number of stripes needed. It concludes with another example involving curtains, reinforcing the method of finding a missing side length through division.

What is the height of the cafeteria wall?

• 10 feet

• 7 feet

• 8 feet

• 9 feet

How do you calculate the area of a rectangle?

• Add the lengths of all sides

• Divide the length by the width

• Multiply the lengths of two adjacent sides

• Subtract the width from the length

If a rectangle is 2 feet by 8 feet, what is its area?

• 16 square feet

• 14 square feet

• 12 square feet

• 10 square feet

How many one-foot wide stripes will fit on a wall that is 9 feet high and 36 square feet in area?

• 2 stripes

• 3 stripes

• 4 stripes

• 5 stripes

What is the missing side length if the area is 36 square feet and one side is 9 feet?

• 2 feet

• 3 feet

• 4 feet

• 5 feet

What is the height of the windows for which the third graders need curtains?

• 6 feet

• 5 feet

• 4 feet

• 3 feet

If a curtain covers 30 square feet and the window is 5 feet tall, how wide is the curtain?

• 7 feet

• 4 feet

• 5 feet

• 6 feet

What equation would you use to find the width of a curtain if the area is 30 square feet and the height is 5 feet?

• 30 = 5 + width

• 30 = 5 - width

• 30 = 5 * width

• 30 = 5 / width

What is the multiplication fact that helps find the width of the curtain?

• 30 = 5 * 4

• 30 = 5 * 5

• 30 = 5 * 6

• 30 = 5 * 7

What is the key takeaway from the lesson on finding missing side lengths?

• Add the area to the known side length

• Subtract the area from the known side length

• Multiply the area by the known side length

• Divide the area by the known side length