Finding Area of Squares and Rectangles

Jada said that she found the area of figure A by cutting it into 3 rectangles, finding their separate areas, and then adding those areas. Which strategy best describes what Jada did?

• decomposing and rearranging

• decomposing

• enclosing and subtracting

• counting grid squares

Diego said he can find the area of figure B by first multiplying 6x6. What should Diego's next step be?

• adding the area of 1 and 2

• subtracting the area of 1 and 2

• Nothing. His area is 36 square units

• decomposing and rearranging

What is the area of this rectangle?  
Length:  9 cm
Width:  3 cm 

• 24 square cm

• 27 square cm

• 93 square cm

• 27 cm 

Which of the following rectangles will have the largest area?  
Length 8 cm  Width 9 cm
Length 6 cm  Width 2 cm
Length 12 cm  Width 2 cm
Length 10 cm  Width 5 cm 

• Length 8 cm  Width 9 cm

• Length 6 cm  Width 2 cm

• Length 12 cm  Width 2 cm

• Length 10 cm  Width 5 cm

How do we solve for AREA of a rectangle?  

• multiply side times 6

• Length x width

• cannot solve, there are no numbers

• add all the sides together

If the AREA of a rectangle is 18 square inches, and the length is 9 inches, what is the width of the rectangle?  

• 3 inches

• 72 inches

• 12 inches

• 2 inches

Which of the following will have the smallest AREA?

• 2 by 4 

• 3 by 12

• 9 by 1

• 6 by 7 

If the perimeter of a rectangle is 12 inches, and the length is 4 inches, what must the width be?  

• 4 inches

• cannot solve

• 2 inches

• 48 inches

Compare these two squares.
A:  4 by 5
B:  10 by 2

• they have the same perimeter

• the widths are the same

• the side lengths are the same

• they have the same area

If a rectangle is 9 cm by 2 cm, what is its perimeter?  What is its area?  

• Perimeter:  22 cm   Area:  18 squared cm

• Perimeter:  18 cm   Area:  22 squared cm

• Perimeter:  18 cm  Area:  18 squared cm

• Perimeter:  20 cm  Area:  22 squared cm