3rd Grade Math 11.1, Model Perimeter

Perimeter is the distance around a shape. We can find the perimeter of a shape by adding the lengths of its sides to find the sum. If all the sides of a shape are equal in length, we can multiply the length of each side by the number of sides. On dot paper, the distance between two dots is one unit. We can count the amount of units to find a figure's perimeter. A rectangle has two pairs of sides of equal length. If we know the length of one side, or two sides, we can find the perimeter of the rectangle. We can use grid paper to find the perimeter of figures by counting the number of units around the sides. We choose a starting point and count around the sides of the shape until we have counted all the units. We find the perimeter of a triangle with sides of equal length that has a perimeter of 15 inches. We find the lengths of the sides of a hexagon, with sides of equal length, that shows one side is 4 centimeters.

3rd Grade Math Playlist (2015)


I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

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