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if 11 squared is 121 and 111 squared is 12321.
what the square root of 12345678987654321?
p.s. i alredy know i'm testing you!
No best answer has yet been selected by PearsonP. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.111111111 ie Nine ones in a row.
The middle or highrst number of the square of any series of ones (eg 11, 111, 1111 ...etc up to nine ones) is the actual number of ones in the square root - if you see what I mean ?
In your question the middle ( or highest number ) is 9 - Hence the answer is 111111111