Analyze the problem and study the answer to the questions. Find the surface area of a cube having a side or edge of 3 cm.
Know:
• What is asked? The surface area of a cube. • What are given? 3 cm – measure of the side of a cube.
Plan:
• What operation will be used? multiplication • What is the number sentence? S² x 6 = n
Solve:
• What is the solution? S² x 6 = n
(3 cm) ² x 6 = n 9 cm² x 6 = n
54 cm² = n
• What is the answer? The surface area of a cube is 54 cm².
Check:
• How do you check your answer? You can change the order of factors.
Check:
6 x 3² = n 6 x (3) ² = n
6 x 9 cm² = n
54 cm² = n