Shaded Grids Rectangles

The figure below shows a big shaded rectangle with a small rectangle cut out of it.

a. Area of the shaded rectangle before it was cut: _ x _ = _

Tags

CCSS.3.MD.C.7D

The figure below shows a big shaded rectangle with a small rectangle cut out of it. b. Area of the unshaded rectangle: _ x _ = _

Tags

CCSS.3.MD.C.7D

The figure below shows a big shaded rectangle with a small rectangle cut out of it. c. Area of the shaded rectangle after it was cut: _ - _ = _

Tags

CCSS.3.MD.C.7D

The figure below shows a small rectangle cut out of a big rectangle. Find the area of the shaded part of the figure.

All of these rectangles have the same area. Use the associative property and move the parenthesis to find the unknown side lengths.

• 8 x 6 = 48

  Area = 48 sq. cm.

• 8 x 6 = 40

  Area = 40 sq. cm.

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3

Label the side lengths of each part of the rectangle. Then, find the total area of the large rectangle by adding the areas of the two smaller rectangles together.

• ( 4 + 4 ) x 7

  (4 x 7 ) + (4 x 7 )

  28 + 28

  area = 56

• ( 5 + 5 ) x 7

  (5 x 7 ) + (5 x 7 )

  35 + 35

  area = 70

• ( 5 + 4 ) x 7

  (5 x 7 ) + (4 x 7 )

  35 + 28

  area = 63

• ( 7 + 7 ) x 7

  (7 x 7 ) + (7 x 7 )

  49 + 49

  area = 98

Tags

CCSS.3.MD.C.7D

Label the side lengths of each part of the rectangle. Then, find the total area of the large rectangle by adding the areas of the two smaller rectangles together.

• 3 x (10 + 3)

  (3 x 10) + (3 x 3)

  30 + 9

  area = 39

• 13 x (10 + 3)

  (13 x 10) + (13 x 3)

  130 + 39

  area = 169

• 10 x (10 + 3)

  (10 x 10) + (10 x 3)

  100 + 30

  area = 130

• 3 x (10 + 3)

  (3 x 10) + (3 x 10)

  30 + 30

  area = 60

Tags

CCSS.4.NBT.B.5

Grandma is making a blanket. She sewed 3 identical pieces of fabric together to make the square.

c. What is the area of 2 pieces of fabric?

• 24 sq. ft.

• 12 sq. ft.

• 4 sq. ft.

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3