Answer :

It is 800.

If you look to the right of the hundreds place, it is a 4.

If it's 4 or under go down, if it's 5 or higher go up.

Since it's 4, we go down, so we get 800.
800

Because it is 800
4 is below 5 which mean that it can't be round off to make the hundred go up one.
Now, if you had 853 then it will be 900.

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