Learning to estimate products is very helpful because it helps with teach you how to learn how to do your taxes and etc.
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Estimating will give an indication of the order of magnitude of the answer. The decimal point determines the order of magnitude.
Estimating the number 684.575 to one decimal place gives you 684.6 which is very close.
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.
If I understand your question correctly - the answer you're looking for is 8.19
The estimated answer for 308 would be 300. When estimating, you round the number to the nearest place value you are estimating for. In this case, we are estimating to the nearest hundred, so we look at the hundreds place digit (3) and drop the tens and ones digits. Therefore, the estimated answer for 308 is 300.