If you are talking about liquid oz, there are 8oz per cup. So 8x8 is 64oz aka half of a gallon.
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There are 8 cups in 64 fl oz.
There are 0.875 (7 divided by 8) 8 oz cups in 7 fl oz.
There are 8 oz in 1 cup, so 4.5 oz / (8 oz / cup) = 0.5625 cups
3 oz is 3/8 of a cup
8 fl oz = 1 cup . . 64 fl oz = 8 cups