ALEX Classroom Resource

Students:

• Measure to find the perimeter of shapes.
• Given a figure, determine the perimeter of the figure.
• Given a figure with a missing side length and a given perimeter, determine the missing side length.
• Solve real-world problems involving perimeters of polygons.
• Use a multiplication expression to find perimeter of a polygon when all side measures of the polygon are equal.

Students know:

• Measurable attributes of objects, specifically perimeter.
• Strategies for modeling measurement problems involving perimeter.
• Strategies for representing and computing perimeter.

The Students are able to:

• Solve real-world and mathematical problems involving perimeters of polygons.
• Find the perimeter of a figure given the side lengths.
• Find an unknown side length of a polygon given the perimeter and one missing side length.

Students understand that:

• Perimeter is measured in length units and is the distance around a two-dimensional figure.
• If all the sides of a polygon are equal, then the perimeter can be determined by multiplying one side length by the total number of sides.

Learning Objectives:
M.3.25.1: Define perimeter.
M.3.25.2: Recall the formula for perimeter (P= L+L+W+W or P=2L + 2W).
M.3.25.3: Recall basic addition and multiplication facts.
M. 3.23.4: Build and draw shapes to possess defining attributes.
M.3.25.4: Express the length of an object as a whole number of length units by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.
M.3.25.5: Describe measurable attributes of objects such as length or weight.