Using a run-of-the-mill electronic calculator, you can calculate the square-root of 13 on your own. You will probably get an answer something like 3.605551275. While this is all well and good, the more inquisitive among you may want to see it to 13,013 decimal places. So, how close to 13 do you get when you square this 13,013 place square-root? Here's the answer.