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# Finding the area of compound shapes

TLF ID L383

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.

#### Educational details

Educational value
• Encourages students to estimate the area of a selection of compound shapes (made up of two rectangles) drawn on a grid.
• Relates the counting of squares in rows and columns to the area of a rectangle rule.
• Provides opportunities for students to practise multiplication facts and addition.
• Provides immediate feedback and helpful hints to students, where necessary.
• Alerts students to the accuracy of their estimation.
Year level

4

Learning area
• Mathematics

#### Other details

Contributors
• Contributor
• Name: University of Western Sydney
• Organization: University of Western Sydney
• Description: Subject matter expert
• URL: http://www.uws.edu.au/
• Description: Technical implementer
• Name: Education Services Australia
• Organization: Education Services Australia
• Description: Data manager
• Publisher
• Name: Education Services Australia Ltd
• Organization: Education Services Australia Ltd
• Description: Publisher