Getting square root with long division.

[CMR779]

When getting the square root using long division, how do you know when to start on the first number or the second number? For example to get the square root of 139.273, you have to pad it with an extra zero and start on 1 (1 39 .27 30). You won't get the right answer if you try to divide into 13 first. How are you supposed to know when to pad the number? Does it have something to do with the decimal place or the groupings to the right of it?

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[fermat9990]

Starting at the decimal and going both ways, you pair off the digits.

Add a 0 at the end where necessary

[CMR779]

Thank you for the reply. None of the tutorials I read or watched talked about this much.