Name
TOPIC
13
Set A pages 701–712
You can find the perimeter by counting unit
segments.
Remember the distance
around a figure is its perimeter.
Reteaching
In 1 through 3, find the perimeter of
each figure.
1.
5 1 cm
The perimeter of this shape is 16 centimeters.
You can find the perimeter of a shape by
adding the lengths of the sides.
10 cm
5 1 in.
2.
6 cm
12 cm
6 cm
6 cm
8 cm
12 cm
6 cm
10 cm
3.
10 + 10 + 8 + 6 + 6 = 40
The perimeter of this shape is 40 centimeters.
5m
5m
3m
5m
4m
1m
4m
1m
Set B pages 713–718
Count the square units inside the shape.
The exact count is the area of the shape.
Remember area is the number of square units
needed to cover a region. A square unit is a
square with sides that are each 1 unit long.
In 1 and 2, count to find the area.
1.
There are 17 squares inside the shape.
The area of the shape is 17 square units.
2.
Topic 13 Reteaching
763
Set C pages 719–730
Remember that a square unit is a square with
sides that are each 1 unit long. You can use
standard units of length for square units.
What is the area of the figure below?
6 in.
In 1 and 2, count the square units.
Then, write the area.
4 in.
1.
4 ft
5 1 square in.
4 ft
1 square unit = 1 square inch
The figure covers 24 square units.
The area of the figure is measured in square
inches.
2.
7 cm
So, the area of the figure is 24 square inches.
6 cm
Set D pages 731–736
You can find area by counting the number
of rows and multiplying by the number of
squares in each row.
In 1 through 3, find the area of each figure.
Use grid paper to help.
4 squares in each row
4 in.
5 rows
Remember that you can multiply the number
of rows by the number of squares in each row
to find the area.
1.
5 in.
6 ft
3 ft
2.
There are 5 rows.
There are 4 squares in each row.
8 cm
4 cm
5 × 4 = 20
The area of the figure is 20 square inches.
3.
8 yd
2 yd
764
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Name
TOPIC
13
Set E pages 737–742
You can use the Distributive Property to
break apart facts to find the product.
Separate the 5 unit side into two parts.
5
2
Area of the large rectangle:
6 × 5 = 30
3
Areas of the small rectangles:
6 × 2 = 12 6 × 3 = 18
6
Remember that you can
separate a rectangle into two
smaller rectangles with the
same total area.
Reteaching
Continued
Write the equations that represent the
picture. Find the area.
1.
Add the two areas: 12 + 18 = 30
You can write a number sentence to show
that the area of the large rectangle is equal
to the sum of the areas of the two small
rectangles.
2.
6 × 5 = 6 × (2 + 3) = (6 × 2) + (6 × 3)
Set F pages 743–748
Find the area of this irregular shape.
3 in.
2 in.
5 in.
A
B
3 in.
Remember that to find the area of an
irregular shape, you can count square units or
divide the shape into rectangles.
In 1 and 2, find the area of each irregular
shape. Use grid paper to help.
1.
Divide the shape into rectangles. Find the
area of each rectangle and add.
A = 5 × 3 = 15 square inches
B = 3 × 2 = 6 square inches
2.
4 ft
15 + 6 = 21 square inches
6 ft
8 ft
3 ft
10 ft
Topic 13 Reteaching
765
Set G pages 749–754
You can use equal areas to model unit
fractions.
Remember that you can label equal parts of a
rectangle with a unit fraction.
Draw a line to separate the rectangle into
3 equal parts. Since each part has the same
area, it is 13 of the whole.
Show two ways to separate the rectangles
into equal parts. Write the fraction that
shows the area of one of the parts.
1. 4 equal parts
Draw a line to separate the same rectangle
into 3 equal parts a different way. Since each
part has the same area, it is 13 of the whole.
Set H pages 755–760
Joan wants to paint part of a wall in her room.
The shaded part of the figure below shows
the part of the wall she wants to paint blue.
What is the area of the part of the wall that
gets blue paint?
Remember that you can break a problem into
simpler problems to solve.
Solve. Use simpler problems.
1. Debra made this design from 1-inch
square tiles. What area of the design did
she make with blue tiles?
5 1 square ft
Area of the whole rectangle:
8 × 5 = 40
Area of the non-shaded rectangle:
3 × 4 = 12
Subtract: 40 - 12 = 28
The area of the wall that gets paint is
28 square feet.
766
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