Understanding Perimeter and Missing Sides

In this math lesson, the teacher introduces the concept of perimeter and how to find a missing side of a shape. Using a treasure map as an example, the lesson demonstrates calculating the perimeter and solving for an unknown side. The teacher emphasizes the importance of not making assumptions based on drawings and provides a step-by-step guide to solving perimeter problems. The lesson concludes with a final example and encourages students to practice further.

What is the perimeter of a shape?

• The area inside a shape

• The distance around a shape

• The volume of a shape

• The number of sides a shape has

If a shape has a perimeter of 30 steps and known sides of 7, 3, 2, 6, and 5, what is the missing side?

• 7

• 6

• 5

• 4

When solving for a missing side, why is it important to add numbers accurately?

• To use fewer steps in the solution

• To make the shape look symmetrical

• To avoid incorrect calculations

• To ensure the shape is drawn to scale

What should you do if you cannot subtract a smaller number from a larger one in a column?

• Skip the subtraction

• Add instead of subtract

• Multiply the numbers

• Regroup from the next column

In which scenario can you assume the lengths of the sides of a shape?

• When the shape is irregular

• When the shape is a circle

• When the shape is a square or rectangle

• When the shape is a triangle

If a square has a perimeter of 16, what is the length of one side?

• 3

• 2

• 5

• 4

How can division help in finding the side length of a square?

• By dividing the area by the perimeter

• By dividing the area by the number of sides

• By dividing the perimeter by two

• By dividing the perimeter by the number of sides

In the final example, if the perimeter is 20 and known sides are 4, 5, 3, 2, and 2, what is the missing side?

• 5

• 4

• 6

• 3

Why is it important not to rely on the drawing's scale when solving for a missing side?

• Drawings are always accurate

• Drawings are not always to scale

• Drawings are only for decoration

• Drawings are meant to confuse

What should you do if you have questions about the lesson?

• Ignore them

• Ask a friend

• Reach out on Google Classroom

• Wait for the next lesson