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Area of a rectangle: count, then multiply
Play Area of Rectangles
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How to play Area of Rectangles
- Read the first step, then press Continue. The rectangle shows how area is counted in unit squares.
- Move the sliders to change the diagram and watch what happens. The readout under the picture shows the numbers.
- Answer each question. If you are wrong you get a hint and can try again, with no penalty.
- Some steps ask you to make something happen, such as hitting a target value. Experiment until it works.
- Finish the lesson to earn XP and see how many questions you got right first time.
Tips and strategy
- Do not rush. The sliders are there to be played with, so try extreme values as well as sensible ones.
- Say what you notice out loud or write it down before you press Continue.
- Use the hint when you are stuck, and then try to explain the answer in your own words.
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FAQ
Area of Rectangles: questions
How do you find the area of a rectangle?
Multiply the width by the height. A rectangle 7 units wide and 4 units high has an area of 7 × 4 = 28 square units.
What is the difference between area and perimeter?
Area is the space inside a shape, measured in square units. Perimeter is the distance all the way around the outside, measured in ordinary units. A rectangle 4 by 4 has area 16 and perimeter 16 by coincidence; most shapes differ.
Why is area measured in square units?
Because we find area by counting how many unit squares fit inside, such as square centimetres (cm²) or square metres (m²).
What age is this lesson for?
It suits ages 7 to 11 (Grades 2 to 5). Younger children can use the counting steps, and older students can use the questions about working backwards.
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