The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".
The first figure to be discarded is the 5 in the ten-thousandths place.
Applying the above rule then :- 170.0875 becomes 170.088 when rounded to 3dp.
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Look at the digit in ten-thousandths place. If it is five or greater, round the digit in thousandths place to the next higher digit. If the digit in ten-thousandths place is less than five, leave the digit in thousandths place as it is. 9.1132 rounded to the nearest thousandths is 9.113.
the answer is 0.08000
You do nothing. It is already rounded to the thousandths, hundreds, tenths and units place.
You would round it up at the third decimal place to 3.116.
It is 64.400