Effect on decimal values rounded to the nearest binary representable power of ten precision?

Question

Actually i have some property in my chart control which create auto scale and enable setting that decimal values should be rounded to the nearest binary representable power of ten precision.

If i have following values then what will be effect on the values if they are as:

326317120.7       
336446588.6     
328645939.5    
328064491.6     
323417873.9

Or

.44   
.43      
.23   
.54    

etc.

What is following line means regarding values conversion:

"decimal values should be rounded to the nearest binary representable power of ten precision"

and how is it effect the values if we apply on some values??

Thanks in advance.