1.

State the two digits (units and ten digits) in the square of any number with 5 as its units digit

Answer»

Step-by-step explanation:

By now, you have learned how to square NUMBERS ending in 5. As a quick refresher, let's say you have a number ending in

5

,

and say the FIRST digits make up the number

N

.

Then the digits of the square of this number will BEGIN with

N

(

N

+

1

)

and end with

25.

For example, take a look at

115

2

.

Step One: Identify

N

:

Here, the number before the last DIGIT of

5

is

11

,

so

N

=

11.

Step Two: Calculate

N

(

N

+

1

)

:

Now, we multiply

N

by

N

+

1

,

i.e. we multiply

11

by

11

+

1

:

11

(

11

+

1

)

=

11

(

12

)

=

132

Step Three: Add

25

to the End:

Now, we just TACK on a

25

to the end of the

132

to get the answer:

115

2

=

132

25

=

13225

Now that we have the basics down, let's learn now to tackle some harder questions.


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