10.3 mBTC = 0.0103 BTC
2.4 mBTC = 0.0024 BTC
*** You divide mBTC by 1000 to get the conversion into BTC
Yeah it's pretty easy. It's like the metric system. You can just go and multiply or divide things by 10. I think a lot of people in the US don't even get how awesome and easy the metric system makes things!
Yeah, people in the US just don't like the metric system for some reason. I can't wrap my head around, why though. It clearly is the superior system on all accounts. But maybe they'll change their mind at some point.