# Finding the area of compound shapes

Learning Material  |  Interactive Lesson

Description
Find the area of compound shapes based on rectangles on a grid. Explore how the formula works for finding a rectangle's area. First, estimate the area of a compound shape based on rectangles on a grid. Second, work out the correct formula for finding area by placing rows and columns of squares inside two rectangles. Then, compare the actual area of the original shape with your first estimate. Practise applying the formula directly to a range of compound shapes based on rectangles. This learning object is the last in a series of two objects that progressively increase in difficulty.
Objective
1. Students estimate the area of compound shapes made up of rectangles.
2. Students investigate the attribute of area by covering compound shapes made up of rectangles.
3. Students use arrays to cover a shape in systematic ways.
4. Students explore the formula for calculating the area of rectangles.
5. Students apply their understanding of the formula to calculate the area of compound shapes made up of rectangles.

#### Curriculum Information

 Education Type K to 12 Grade Level Grade 2, Grade 4, Grade 3 Learning Area Mathematics Content/Topic Measurement Intended Users Educators, Learners, Students Competencies