Estimating will give an indication of the order of magnitude of the answer. The decimal point determines the order of magnitude.
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Divide as normal, but make sure to place the decimal point in the quotient directly above the decimal point in the dividend.
The decimal point moves to the left.
Ex: 52.73 x 384.12 Round to 50 x 400 = 20,000 so when you do the actual math you know that there are 5 places to the left of the decimal.
You just continue to do the division, until you calculate the third digit after the decimal point. Then you round.
The decimal point moves 3 places to the right.