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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Question 20

In the following question, out of the four options, only one is correct. Write the correct answer:

$(- 9)^{3} \div (- 9)^{8}$ is equal to:
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Question 20

In the following question, out of the four options, only one is correct. Write the correct answer:

$(- 9)^{3} \div (- 9)^{8}$ is equal to:
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(c) $(- 9)^{5}$
(d) $(- 9)^{- 5}$

5 A \times A = 399

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