240
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It is 240.
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
10 because 8 is to small to have this and 10 is the first ten there is
Rounded to the nearest ten it is 10 but rounded to the nearest tenth it is 12.6
245 to 254
70
420