What does iphone mean when it says 879 MB sent and 4.6 GB received?

I've just purchased a new iPhone and I'm still a bit new to understanding a couple terms. Anyway, I've read that to calculate data you have to add the two (sent and received) but is it still the same for when one is in MB and the other is in GB?

Please help as I would like to make sure I haven't exceeded my total data usage.

1GB = 1024MB, so 4.6GB is 4710.4MB, plus the 879 equals a total of 5589.4MB. You have used a little over 5.5GB of data.

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