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In general any two digit square equals;
i got the right question now (( sorry for bothering man but i am new here )) ... i think i agree with your solution
he gave 35*35 as an example. he said it works with 35 but asked why :-)
he said that it doesnt work with 35 ! so i showed him ... sorry maybe i didn't get your question explain more man
I didn't. Never heard this before.
Raulito this we already know the question was about proving it.
to square a 2 digit number ending with 5 you have to follow these steps :
If that wasn't clear, what you are doing is getting them number a(a+1) like you said (3*4), and then shifting that over two digits to make room for the 25 on the right.
this is what i came up with:
When you want to square a number ending in a 5, you take the tens column and add one and multiply it to the original tens digit and place it in front of 25... not a good description.