You look to the thousands place and if that number is greater than 5 or 5 you add 1 to thehundreths place, if it is less than 5 than it stays the same.
Example
1.3478
1.348
A hundredth, in terms of a decimal is two places to the right of the decimal point. So to round 123.4567 to the nearest hundredth you would need to reduce .4567 to only 2 decimal places. Any digit of...