To round 872 millimeters to the nearest tenth of a millimeter, we first need to identify the tenths place in the number.
The number 872 can be represented as follows:
8 7 2
↑
8’s place (hundreds) 7’s place (tens) 2’s place (units)
Since we are rounding to the nearest tenth, we can consider the number 872.0, where the ‘0’ represents the tenths place. The digit to the right of the tenths place (the hundredths place) is ‘0’.
According to rounding rules, if the digit in the hundredths place is less than 5, we round down. Since our digit is ‘0’, we round down to 872.0, which remains 872.
Thus, the final answer is:
872 millimeters rounded to the nearest tenth of a millimeter is 872.0 millimeters.