So heres the question. Im looking at these inductors that are color coded like resistors but its been so long i dont remember how the decimal works out. red black red silver would normally be 2 with +- 10% but its a 2M henry inductor.

 

Here's an online calculator for you:
http://www.electronics2000.co.uk/calc/inductor-code-calculator.php
A bit of experimentation should make it all clear.