Puzzles / Brain Teasers

Here's a short framed one .

23 x 23 = 7

25 x 25 = 4

Then , 27 x 27 = ?


23 x 23 = 529 = 5+2+9 = 16 = 1+6 = 7

25 x 25 = 625 = 6+2+5 = 13 = 1+3 = 4

27 x 27 = 729 = 7+2+9 = 18 = 1+8 = 9

Step 1 : Multiply .
Step 2 : Check whether the product is greater than 9 .
Step 3 : If step 2 is true , then sum of the digits & if still greater than 9 then this process of sum continues .
Step 4 : Terminate if the result has become a single digit .
 
23 x 23 = 529 = 5+2+9 = 16 = 1+6 = 7

25 x 25 = 625 = 6+2+5 = 13 = 1+3 = 4

27 x 27 = 729 = 7+2+9 = 18 = 1+8 = 9

Step 1 : Multiply .
Step 2 : Check whether the product is greater than 9 .
Step 3 : If step 2 is true , then sum of the digits & if still greater than 9 then this process of sum continues .
Step 4 : Terminate if the result has become a single digit .
Excellent puzzle but far too involved for my simple mind :p
 
Pass.


And after this one, I've one of my own :)
 
What is the black item
The black item is this
d4fbc089-a3ac-448a-b703-123c3e4f20b8-jpeg.219973
 

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