160
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It is 160.
Although many schools teach you to round 5 up, 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
It is then 740 when rounded to the nearest ten.
260
320
rounded to the nearest ten... it would be 420.
Rounded to the nearest ten thousands it is 0. In fact, to the nearest ten it is 0.