What kind of Accuracy is needed?

liam mixermic Source

I have been doing some reasearch on pi and eulers number and the calculations / programming involved. And I cannot find any information about what kind of accuracy you need for the devision.

For example:

1 / 120 = 0.008333333333333333

1 / 720 = 0.001388888888888889

You can tell that the number is a repeating number and will go on forever. So my question is when do you know when you have enough digit. Any thoughts would be helpful! Thanks.



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