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Why do valuation techniques? The math problem says to keep three decimal places, but you have to go to the fourth place to get an approximate value.
Because you may be greater than or equal to five when you get to the fourth place, you have to round to the third place, and then you can decide whether to give up or enter.

For example, 1 divided by 6

Except for the third place, it is 0. 166.

If you divide by the fourth place, it is 0. 167.

Except for the fourth place, it is more accurate.