# Technician: Mega vs. Giga

## If a frequency readout shows a reading of 2425 MHz, what frequency is that in GHz? [T5B13]

A. 0.002425 GHZ
B. 24.25 GHz
C. 2.425 GHz
D. 2425 GHz

The best way to figure this out is to review our metric prefixes.  If you’re into computers at all, you already use “Mega” and “Giga” and probably even “Tera” more often than you think.

Break that down, and you get something like this:

Mega = million = 1,000,000
Giga = billion = 1,000,000,000
Tera = trillion = 1,000,000,000,000

you’ll notice that each one is 1,000 times larger than the one before. So…..

if we have 2425Mhz, or Megahertz we can take that number, divide it by 1,000, and we get our answer.

Wait, divide? I thought you said Giga was 1,000 times bigger?!  Correct!  If we want to convert Mega into Giga, we need to divide.  Think of it this way.  If we have 10 apples, how many hundreds of apples do we have?  .1! How did we get there? We divided by 10.  Same principle.  A single Gigahertz is 1,000 Megahertz.

Therefore, our answer is C. 2.425Ghz.