Question

Which of the following will have 4 at units place?

a)14^2

b)62^2

c)27^2

d)35^2​

Answer 1

Answer:

62^2 will have 4 at unit's place

Step-by-step explanation:

See here,

There is a square power upon 62

If we multiply 62 * 62 (two times)

We get 3844 there is 4 at unit's place

So 62^2 has 4 at its unit's place

Same way here if we multiply 14^2 we get 196

27^2 we get 729 35^2 we get 1225

Here there is no 4 at unit's place.

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Answer 2

Numbers

Explanation:

For finding the numbers at unit place,  we need to check the multiples of base number, then check the power  of the base number.

So, checking option a,

$14^{2},\\The \ unit \ place \ of \ base \ number\ is\ 4.\\\\We \ know \ that \ 4^2=16\\\\So, \ the \ unit \ place \ will \ be \ 6.$

For option b,

$62^{2},\\The \ unit \ place \ of\ base \ number\ is\ 2.\\\\We \ know \ that \ 2^2=4\\\\So, \ the \ unit \ place \ will \ be \ 4.$

For option c,

$27^{2},\\The \ unit \ place \ of \ base\ number\ is\ 4.\\\\We \ know \ that \ 7^2=49\\\\So, \ the \ unit \ place \ will \ be \ 9.$

For option d,

$35^{2},\\The \ unit \ place \ of \ base\ number\ is\ 5.\\\\We \ know \ that \ 5^2=25\\\\So, \ the \ unit \ place \ will \ be \ 5.$

Hence, option (b) has 4 at unit place.