Q1
What is 5²?
A25
B10
C5
D52
ICSEClass 8 (ICSE)MathematicsCh 3 · Topic 2
Practice and Revision - Squares and Square Roots
Let us practise and revise what we learned about squares and square roots. A square number results from multiplying a number by itself, and
Core concept
A square number, like 25 (5×5), results from multiplying a number by itself, and we write this as 5².
How it works
The square root of a number, written as √25, is the value that when squared gives that number - so √25 = 5.
Why it matters
We can find square roots using methods like prime factorisation or the long division method for larger numbers.
Key detail
Understanding squares and square roots is essential for solving geometry problems, like finding side lengths using area.
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Quick notes
• A square number results from multiplying by itself.
• 25 = 5² (5×5).
• A square root is the inverse of squaring.
• √25 = 5.
• We can find square roots by prime factorisation.
• The long division method works for larger numbers.
• Squares and roots help solve geometry problems.
• They help find side lengths from area.