PERIMETER AND AREA REVIEWFor BBES 3rd Graders

WHAT IS PERIMETER?

Perimeter is the distance around something, like a fence.

TO FIND THE PERIMETER

Add all the sides together to find the perimeter.

8 cm

8 cm

3 cm3 cm

8 cm + 8 cm + 3 cm + 3 cm = 22 cm

REMEMBER TO LABEL YOUR ANSWER!

Look at the unit that the object is being measured in.

Label your answer with the same unit.

FIND THE PERIMETER

5 ft

10 ft

5 ft

10 ft

10 ft + 10 ft + 5 ft + 5 ft =

30 ft

TRY THIS ONE…

13 in. 13 in.

13 in. 13 in.

13 in.

13 + 13 + 13 + 13 + 13 =

65 in.

HERE IS ANOTHER…

5 cm9 cm

9 cm 5 cm

4 cm

1 cm

1 cm

9 + 9 + 1 + 1 + 5 + 5 + 4 =

34 cm

HOW WOULD YOU SOLVE THIS ONE?

6 ft.

6 + 6 + 6 + 6 =or

6 X 4 =

24 ft.

YOU CAN FIND THE PERIMETER OF EVERYDAY OBJECTS…A basketball court is one example:

15 m

28 m

AND THE PERIMETER OF THE BASKETBALL COURT IS…

15 + 15 + 28 + 28 =

86 m !

WHAT IS AREA?The amount of surface inside a

shape; measured in square units.

TO FIND THE AREA:

One way is to count up the squares.

8 sq. cm.

ANOTHER WAY TO FIND THE AREA:

4 units

4 X 4 = 16 sq. units

TRY ANOTHER:

6 units

2 units

6 X 2 = 12 sq. units

FIND THE AREA…

8 ft

5 ft

8 X 5 = 40 ft2

REMEMBER…Perimeter is the distance AROUND something.

Area is the amount of surface INSIDE a shape.