Understanding Perimeter

The video tutorial covers a third-grade math problem on perimeter from the 2021 STAR test. It explains how to find the length of a rectangle when given the perimeter and width. The teacher guides students through problem-solving strategies, highlights common mistakes, and demonstrates the correct solution using both intuitive reasoning and the perimeter formula.

What is the main topic discussed in the video?

• Area calculation

• Volume measurement

• Perimeter understanding

• Weight measurement

What is the perimeter of the rectangular floor given in the problem?

• 66 feet

• 56 feet

• 36 feet

• 46 feet

What is the width of the rectangle as provided in the problem?

• 15 feet

• 10 feet

• 5 feet

• 20 feet

What is the first step in solving the problem according to the video?

• Guess the length

• Use a calculator

• Identify the given width and perimeter

• Measure the length with a ruler

How much of the perimeter is used by the two widths?

• 20 feet

• 10 feet

• 40 feet

• 30 feet

What is the common mistake made when calculating the length?

• Forgetting to add the widths

• Using the wrong formula

• Not subtracting the widths from the perimeter

• Assuming the length is 26 feet

What is the correct length of the rectangle?

• 15 feet

• 26 feet

• 13 feet

• 10 feet

What is the formula for calculating the perimeter of a rectangle?

• Perimeter = Length x Width

• Perimeter = 2 x (Length + Width)

• Perimeter = Length + Width

• Perimeter = Length x 2 + Width x 2

How do you find the length if the perimeter and width are known?

• Multiply the width by 2

• Subtract the width from the perimeter

• Divide the perimeter by 2

• Subtract twice the width from the perimeter and divide by 2

What grade level is the problem designed for?

• Sixth grade

• Fifth grade

• Third grade

• First grade