Area of Rectangles for 4th Grade
The area of a rectangle is length times width, because multiplying gives the number of unit squares that tile it. Counting the squares first makes the formula obvious rather than arbitrary. The examples below build from counting to the formula, with practice problems.
Free tool: try the problems from this lesson in our Area & Perimeter Calculator.
DETAILED EXPLANATION
The area of a rectangle is length × width. Area is measured in square units (square inches, square centimeters, etc.). It tells how many unit squares cover the rectangle.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
A rectangle has length 9 cm and width 5 cm. Find its area.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: Area = 9 × 5 = 45 square centimeters.
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