3.MD.C.7d- Finding the Area of Rectilinear Figures

Evidence Statement 3. C.3-2 Base arithmetic explanations or reasoning on concrete referents such as diagrams (whether provided in the prompt or constructed by the student in their response) connecting the diagrams to a written (symbolic) method. 

Karim's Garden

Karim’s garden is pictured below.

This is a rectilinear figure. One rectangle is 6 feet by 4 feet. The other rectangle is 3 feet by 7 feet.

What is the area, in square feet, of both parts of Karim’s Garden altogether?  

Show all your work or explain how you found the total area of Karim’s garden.

Enter your answer and work or explanation in the space provided.

Student Copy

Scoring Rubric

Score 2 Student response includes the following 2 elements.  

• Computation component = 1 point  

o   The student provides the correct total area 45 square feet.  

• Reasoning component = 1 point  

o   The student provides a valid explanation for how to find the total area or valid work for finding the total area.  

Score 1 Student response include 1 of the above elements.  

Score 0 Student response is incorrect or irrelevant.