Sometimes it takes two or more steps to convert units.
Example Problem: convert 25.3 cm to km.
If you don’t know a direct conversion factor to get from cm to km, convert to meters first (1 m = 100 cm).
Solution Step 1:
Now cm has canceled out. We could multiply it out to see how many meters it is, but we don’t need to. Instead, multiply by a second conversion factor to get from m to km (1 km = 1000 m).
Solution Step 2:
Now meters cancels and leaves an answer in kilometers.