Numerical value returns differ from actual

Question

This might be a commonly known thing, but I wonder if there is any best practice of dealing with data spill-over in Delphi.

Say I have a variable Dt that is assigned a value of 0.01 in code. When Delphi runs through it, the value of Dt in debug mode is 0.0099999997765, slightly off the actual value of 0.01. Although the values are not significantly different, using Dt in an iteration of 10000 steps will lead to it.

Any suggestion on how to force Dt to 0.01? Also, I am using Delphi 2003, so there are constrains on what I can do.

Dt:= 0.01    //Debug value = 0.0099999997765
.
for I=0 to 10000
   temp := temp + Dt;  

The issue is more prominent as temp starts to spill, as well resulting in an answer that far off what is expected. Any suggestions?