Module 11 of 15 Area and Perimeter 3rd Grade Math

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Module 11 of 15
Area and Perimeter
3 rd Grade Math
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perimeter

perimeter
Amy and Ben wanted to build a backyard pen for their new puppy. After
measuring the yard, they drew a picture showing the shape and size of the pen.
Ben asked, “How will we know how much fencing to buy at the store?” Amy, who
was older and wiser than her younger brother, replied, “We have to add up all the
lengths of all four sides of our rectangle. The sum of all the sides is called the
perimeter.”

Amy wrote a math sentence using the measurements of the rectangle.
Perimeter = 16 + 16 + 8 + 8
Do you know how much fencing Amy and Ben will need?
+
2
16
16
8
8
48 ft

What if other parts are not
labeled?
This will be 1 foot
since the length
is equal to the
ones opposite of
it.
This will be 5
inches since the
length is equal to
the ones opposite
of it.
Same length
5 inches
Solution:
12 inches
12 inches + 12 inches + 5 inches + 5 inches = 34 inches
Perimeter = 34 inches

Practice
What’s the perimeter?
Solve it here:
Solve it here:

Practice
What’s the perimeter?
Solve it here:
Solve it here:
Solve it here:

Answer
What’s the perimeter?
Solve it here:
P= 9+5+11 = 25 cm
Solve it here:
P = 8+8+3+3 = 22 cm

answer
What’s the perimeter?
Solve it here:
P = 3+3+3+3+3 = 15 in.
OR 3 X5 = 15 in.
Solve it here:
P= 4+4+4 = 12 cm.
OR 4x3 = 12 cm.
Solve it here:
P = 2+2+2+2 = 8 in.
OR 2x4 = 8 in.

Practice 1: What’s the area?
Solve it here:

Answer
Practice 1
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
To get the area, we need to multiply the length X width.
A = 10 cm X 5 cm = 50 squared cm.
OR – you can simply count the squares inside the figure.

Practice 2: What’s the area?
Solve it here:

answer
Practice 2: What’s the area?
Solve it here:
Area = L x W
A = 11cm. X 4 cm. = 44 squared cm.

Your turn

Q. 1
Solve it here:

Q. 2
Solve it here:

Q. 3
Solve it here:

Q. 4

Q. 5

answers

Q. 1
Solve it here:
Perimeter = 90 + 90 + 40 + 40 = 260 cm
+
90
90
40
40
260

Q. 2
Solve it here:
15
1 2 3 4
5 6 7 8 9 10
11 12 13 14
16

Q. 3
Solve it here:
1 2 3 4
5 6 7 8
9
10
11
12
13 14 15 16
17 18 19 20

Q. 4
14 ft
18 ft
20 ft
5 ft
12 ft
18 ft
5 ft
15 ft
20 + 20 + 5 + 5 = 50 ft
14 + 14 + 12 + 12 = 52 ft
18 + 18 + 5 + 5 = 46 ft
15 + 15 + 18 + 18 = 66 ft

Q. 5
1 2 3 4
5 6
7 8 9 10
11
12
13
14
15
16
17
18

• Borrow the Mathematics Chart from your
teacher. Find the area and perimeter of
the following;
Your desk: A: ____ P: ____
Your book: A:_____ P: ____
• Next time you wrap a gift for someone,
find out how much wrapping paper you
need.
• Look at the tiles in your classroom. Find
out the area and perimeter.
A= ____
P = ____

Congratulations!!!
Job Well Done, and we will see you again soon
in
“Dr. Dragonosky’s
Mad math Lab!!”