What numbers can be rounded to the nearest ten to make 800?

Answer 1

Half of 10 is 5.

So numbers in the range 800 ± 5 round to 800 to the nearest 10, except that numbers exactly half way round up. Thus all numbers greater than or equal to 800 - 5 round up to 800 and all numbers less than 800 + 5 round down to 800,

That is all numbers greater than or equal to 795 and less than 805 will round to 800 to the nearest 10.