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Maths CBSE Live product
Class 8 (2025-26)
A Square and A Cube
PT3 Revision I - A Square and A Cube
5.
Find the square of a number
Question:
3
m.
We can find out whether a number is a perfect square by successively subtracting odd numbers.
Using the pattern above, find
18
\(^2\), given that
\(18^2 = 324\)
359
355
370
364
How do we find the
18
\(^{th}\) odd number?
By adding \(17^{th}\) odd number to \(324\)
By adding \(16^{th}\) odd number to \(324\)
By adding \(18^{th}\) odd number to \(324\)
By adding \(20^{th}\) odd number to \(324\)
What is the \(n^{th}\) odd number?
\(n^2\)
\(2n\)
\(2n+1\)
\(2n-1\)
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