Math Games

Grade 3 - Shape and Space

Standard 3.SS.3 - Find the perimeter of a complex figure.

Included Skills:

Demonstrate understanding of linear measurement (cm and m) including:
• selecting and justifying referents
• generalizing the relationship between cm and m
• estimating length and perimeter using referents
• measuring and recording length, width, height, and perimeter.
• Observe and describe situations relevant to self, family, and community that involve measuring lengths, including perimeter, in cm or m.
• Measure and compare different lengths on 3-D objects to select personally relevant referents for 1 cm, 10 cm, and 1 m.
• Create models to generalize a numerical relationship between cm and m (i.e., 100 cm is equivalent to 1 metre).
• Pose and solve situational questions that involve the estimating or measuring of length (including perimeter) using cm or m.
• Identify and determine the length of the dimensions of a personally relevant 2-D shape or 3-D object.
• Explain why sometimes different names are used for different length measurements (e.g., height, width, or depth).
• Sketch a line segment of an estimated length and describe the strategy used.
• Draw a line segment of a given length and explain the process used.
• Relate measuring using a referent for 10 cm to skip counting quantities by 10s.
• Create a picture of a 2-D shape with specified length and width (or length and height) and explain whether the 2-D shape was constructed using estimates or actual lengths.
• Measure and record the perimeter of regular 2-D polygons and circles located on 3-D objects, and explain the strategy used.
• Measure and record the perimeter of a given irregular 2-D shape, and explain the strategy used.
• Construct or draw more than one 2-D shape for the same given perimeter (cm, m).
• Estimate the perimeter of a given 2-D shape (cm, m) using personal referents and explain the strategies used.
• Critique the statement "perimeter is a linear measurement".
• Sort a set of 2-D shapes into groups with equal perimeters.