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Checking Perfect Square by Unit Digit

Question 3 Wr...

Question

Write the correct answer from the given four options.

A number ending in $9$ will have the unit's place of its square as

a) $3$
b) $9$
c) $1$
d) $6$

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Solution

The correct option is C: $1$
We know that, if a number is ending in $1$ or $9$ in the unit's place, then its square ends in $1.$
The number ending in $9$ , will have the unit's place of its square as $1$ . $[∵ 9 \times 9 = 81]$

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Checking Perfect Square by Unit Digit

Standard VIII Mathematics

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