AQA · Mathematics · 8300
GCSE Maths: Area: on a grid
Geometry & Measures · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise for Area: on a grid (Corbettmaths Video 43), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What is the unit of area when measuring shapes on centimetre-squared paper?
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cm² (square centimetres)
How do you find the area of a rectangle on a grid?
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Count the number of unit squares inside the rectangle, or multiply length by width.
If a square has an area of 25cm², what is the length of one side?
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5cm (since 5 × 5 = 25)
If a square has a perimeter of 12cm, what is the length of one side?
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3cm (since perimeter = 4 × side length, so 12 ÷ 4 = 3)
What is a common mistake when stating the area of a shape in centimetres?
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Using 'cm' instead of 'cm²' — area is measured in square units, not linear units.
When estimating the area of an irregular shape on a grid, what method can you use?
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Count the full squares, then estimate fractional squares (e.g., counting partial squares as halves or combining them).
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