Perimeter & Area Mrs. Mitchell

Today’s Objectives: Learn what it means to find perimeter and area. Practice finding or estimating the perimeter and area.

Perimeter Perimeter is the distance around a shape or objects. Calculate the perimeter by counting the distance around the shape.

Find the Perimeter Start Here 1 2 3 4 5 6 7 End Here 18 8 17 9 16 1 cm 15 14 13 12 11 10 Perimeter = 18cm Let’s say one “square” is one centimeter... Now count the squares’ sides around the rectangle...

Always label your answer  Find the Perimeter A square is the same length on each side... 4 cm 4 4 4 +4 4 cm 4 cm You can add the sides together to find the total distance around the shape! 16 cm 4 cm Always label your answer 

Area Area is the number of square units needed to cover a shape. Calculate the area by counting the squares that fill in the shape or multiplying the length times width. Always label area as squared (ex: 1 square centimeter or 1cm2.)

Find the Area 6 centimeter squares Start Here 1 2 3 4 5 6 3 centimeter squares 12 11 10 9 8 7 End Here 13 14 15 16 17 18 Let’s say one “square” is one centimeter by one centimeter or one square centimeter... Area = 18cm2 Now count the squares in the rectangle... You can also multiply length times width... 6 x 3 = 18 cm2

Always label your answer  Find the Area You can multiply the length times the width to find the area! 4 cm 3 cm 3 cm 4 x 3 = 12 cm2 4 cm See – 12 cm sized squares or 12cm2 Always label your answer 

Today’s Ohio State Content Standards... Grade 3 – Math Standard: Measurement Benchmark D: Identify appropriate tools and apply counting techniques for measuring side lengths, perimeter and area of squares, rectangles, and simple irregular two-dimensional shapes, volume of rectangular prisms, and time and temperature. Indicator # 7: Make estimates for perimeter, area and volume using links, tiles, cubes and other models.