2160
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It is 2160.
Although many schools teach you to round 5 up (so to 2170), always rounding up from 5 is inappropriate because it introduces an upward bias. The IEEE (Institute of Electronic and Electrical Engineers) standard 754 is to round 5 up or down so that the new last digit is even. See link for more: //en.wikipedia.org/wiki/Rounding#Round_half_to_even
round to the nearest ten thousandth 44.24862486
96 round to the nearest ten=100
300
645 rounded to the nearest ten would simply be 650.
9.72 to the nearest ten is 10.