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Batting average = hits / at bats - the percentage of times that a batter gets a hit.
On Base Percentage = (hits + walks + HBP) / (at bats + walks + HBP) - the percentage of time a batter successfully gets on base. Since walks and HBP's don't count as official at bats, they are added both to the number of at bats to get the total plate apperances, and also to the number of hits to get the number of times the batter successfully gets on base.
Still a bit confusing, I know, but hopefully this helps.
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