Learning Objectives
- Understand the concept of area using square units
- Find the area of shapes by counting squares
- Estimate the area of irregular shapes
- Compare areas of different shapes
Key Concepts
What is Area?
Area is the amount of flat space a shape covers. Think of it as how many square tiles you need to cover a surface completely. We measure area in square units, like square centimetres (sq cm) or square metres (sq m). A bigger shape covers more space and has a larger area.
Counting Squares to Find Area
Draw a shape on squared paper (graph paper). Count the number of complete squares inside the shape. That gives you the area. If a rectangle covers 12 full squares on graph paper, its area is 12 square units. This method works well for rectangles and squares.
Dealing with Half Squares
Some shapes have squares that are only partly inside the shape. Count full squares first. Then count half squares. Two half squares make one full square. If a shape has 8 full squares and 4 half squares, its area is about 8 + (4 ÷ 2) = 8 + 2 = 10 square units. For more than half, count as 1; for less than half, count as 0.
Comparing Areas
To compare the areas of two shapes, count the squares for each and see which has more. Two shapes can look different but have the same area! A long thin rectangle and a square might both have the same area of 16 square units if the rectangle is 8 x 2 and the square is 4 x 4. Area is about the total space, not the shape.
Important Terms
- Area: The amount of flat space covered by a shape
- Square Unit: A unit used to measure area, shaped like a small square
- Square Centimetre (sq cm): A square that is 1 cm on each side
- Square Metre (sq m): A square that is 1 m on each side
- Graph Paper: Paper with printed squares used for counting area
Quick Revision
- Area = the flat space a shape covers
- Count full squares inside the shape on graph paper
- Two half squares = one full square
- Different shapes can have the same area
- Area is measured in sq cm, sq m, or other square units
- For irregular shapes, estimate using more-than-half and less-than-half rules