Math Is Fun Forum

lancemaria

Member

Registered: 2007-05-22

Posts: 3

TRy to get a perfect square

Hello Everyone,
To get the product of two the same number.
Example:
         12 x 12 = 144
To get et easily,
Multiply the first number (1x1) = 1
And then the last digit (2x2) = 4
And then to get the mid number simply like this (1x2) + (1x2) = 4
you will get an answer of 144...

try this one 26x26 ? =

Last edited by lancemaria (2007-05-22 16:01:10)

Big Mac

Member

Registered: 2007-05-19

Posts: 20

Re: TRy to get a perfect square

Hi Maria

Why not try this alternative way using easy square numbers....

26 x 26

This is 4 away from 30 so...... add and subtract 4 to 26 to get   22 x 30 = 660
                                     Then add on your 4 squared                         = 660 + 16 = 676

eg 13 x 13 = (10 x 16) + (3 x 3) = 169

Neat eh? - hope this of use.

---

I think, therefore I am.

lancemaria

Member

Registered: 2007-05-22

Posts: 3

Re: TRy to get a perfect square

yup,.. neat...
also a good idea , another way of learning...
also great.
How about eliminating and substitute?
some of the equations?