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Surf for More Math

Lesson 4 - Area Rule for Rectangles


Use this interactive activity to encourage students to have fun on the Web while learning about the area rule for rectangles. Students can try this activity on their own or in pairs.


Develop and explain a rule for calculating the area of a rectangle.

Builds Upon

Student Book pages 228-229

Instructions for Use

Area of Rectangles and Squares helps students relate the length and width of a rectangle to area.

To use Area of Rectangles and Squares, drag both blue buttons along the sliders to illustrate that changing the length and width of a rectangle, changes its area and perimeter.

Notice how the Web page uses the area rule for rectangles to calculate the area. Count the squares in the rectangle to see if the area is correct. Check many different rectangles to see if the rule is always correct.