For a quick estimate, you would usually round to one, sometimes to two, significant digits. One significant digit means discarding all digits after the first, i.e., converting them to zero (and rounding the remaining digit up or down as appropriate).
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She should round to the nearest hundred. why?
170 is already at the nearest ten. It will round up to 200 to be to the nearest 100.
60 to the nearest ten and 800 to the hundred
Your sum might be less than fifty and you would rather round to forty than zero.
To the nearest ten: 360 To the nearest hundred: 400