Half of $7 or half of $7.00 is $3.50
So if you want to split $7.00 with someone you would take $3.50 and give the other person $3.50 out of the $7.00
So you would have $3.50 and the other person would have $3.50
Or if you find something on sale and the price for the sale is half off and the original price was $7.00 and there's a half off sale or a 50 percent off sale then it would cost you $3.50
Half off of $7.00 is $3.50