Grade 4 Math: Area & Perimeter: Standard Practice

# Medium Level Guide Grade-level practice aligned to typical classroom expectations and unit assessments. # Perimeter Perimeter is the total distance around a shape. For a rectangle, add all four sides or use P = 2l + 2w. Perimeter is measured in linear units such as centimeters or feet. Fencing a yard and framing a picture are real situations that use perimeter. # Area of Rectangles Area measures the space inside a shape in square units. The area of a rectangle equals length times width: A = l × w. A square is a special rectangle where length and width are equal, so A = s × s = s². # Composite Shapes Some figures combine two or more rectangles. Split the shape into familiar parts, find each area, then add. For perimeter of composites, trace only the outer boundary and add those side lengths. # Choosing the Right Measure Use perimeter when the question asks how far around something goes. Use area when the question asks how much space something covers. Carpeting a floor uses area; putting a border around a poster uses perimeter.