Not sure exactly what your asking but here is an example.
If a team has 12 wins at home and 3 losses at home you would do the following to see their winning %
100 divided by 15(total home games played) = 6.66666666
Then 6.6666666 X 12(games won) = 79.9999999% So the team won 80% of its home games and lost 20 % of them.
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