Depends on what the situation and number is. In generally, there can be as many digits as needed after a decimal point. The amount is infinity.
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Move the decimal point three places to the right.
It moves three places to the right.
To the left of the decimal point, you place a decimal at an interval of every three digits.
Three. This refers to the number of significant digits AFTER the decimal point.
33.487 is already rounded to three decimal places. if it were 33.4829, which is four decimal places, you would round it to the nearest three DECIMAL places, which would be 33.487. So, the answer to your question is; 33.487 is already rounded to three decimal places.