a number that correct to 2dp is 2.37

How about 

2.37465892

or

2.365

or

2.365190352

or

3.370499999

 

If the number in the 3rd decimal places is 4 or less then the one in the 2nd place stays the same,

If the number in the 3rd decimal places is 5 or more then the one in the 2nd place goes up by one!

I hope that helps,