Again, that is why the metric system is the way to go, or the way we should have gone. It's all based on tens, just like our money. Look at it this way.
$1 = 1 mm.
Each mm is broken into 100 parts as $1 has 100 pennies.
So $.25 equals .25mm, $.89 = .89mm and so forth.
10mm = $10
100mm = $100
1000mm = $1000 and 1000mm = 1 meter
1000 meters = 1 kilometer
There now, that's easy as pi