1. Surface Area Developing: Define the term surface area.
Secure: Calculate the surface area of 3D objects.
Exceeding: Explain how surface area affects the rate of absorption.
Entrance Activity
Tool Box – Key Words

2. Key Word Alert!
Surface Area
The surface area of a solid object is a measure of the total area that the surface of the object takes up. (cm2)
Arrange the boxes in order of larges surface area to smallest surface area. A E C B D

3. Calculating Surface Area
Teacher Explanation
Calculating Surface Area
To calculate the surface area of a 2D object we need to multiply the height by the length.
Width 5 cm
Height x width = Surface area
30cm x 5cm = _____cm2
30cm x 5cm = 150cm2
Learning activity
Height 30cm
Calculate the surface area of the following objects:
Piece of paper, Mini whiteboard, Large whiteboard, Table, Any other square objects you can find. (10 mins)

4. Calculating Surface Area
Teacher Explanation
Calculating Surface Area
When calculating the surface area of a cube or cuboid, we need to dismantle the object and calculate each side as a single 2d shape.
Top
5cm
8cm
Back
2cm
5cm
Right side
8cm
2cm
Left side
8cm
2cm
Bottom
5cm
8cm
Front
2cm
5cm

5. Learning Activity
Select three to five cuboids from the list below and calculate the area of each one in your books.

6. Calculating Surface Area
Teacher Explanation
Calculating Surface Area
Your teacher will provide you with a range of boxes, uses these to practice your calculation skills. Try and find the surface area of 3 different sized boxes.
Width 5 cm
Height x width = Surface area
30cm x 5cm = _____cm2
30cm x 5cm = 150cm2
Height 30cm

7. Plenary
Creating questions
Create your own question regarding surface area. Include a two part question, a mark scheme, and then get someone to answer the question.