0.40
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round tu 2 digits aft desimal point
The answer depends on the number of significant digits that you wish to round to.
The nearest numbers on either side, to two significant digits, are 180.0 and 190.0. The first of these is nearer to 184.8
It is 1570000 rounded to 3 significant figures
Assuming that the last two digits are indicators of precision, there are 5 significant digits.