To find out how many cups of ice cream Joe used to make 8 ice cream sundaes, we start by determining how much ice cream is used for each sundae and then multiply that by the number of sundaes.
Each sundae uses \( \frac{3}{4} \) of a cup of ice cream. Therefore, for 8 sundaes, the total amount of ice cream used can be calculated as follows:
\[ \text{Total ice cream} = \text{Number of sundaes} \times \text{Ice cream per sundae} \]
Substituting the values:
\[ \text{Total ice cream} = 8 \times \frac{3}{4} \]
To perform the multiplication, we can treat \( 8 \) as \( \frac{8}{1} \):
\[ = \frac{8}{1} \times \frac{3}{4} = \frac{8 \times 3}{1 \times 4} = \frac{24}{4} \]
Now, simplify \( \frac{24}{4} \):
\[ \frac{24}{4} = 6 \]
Thus, Joe used a total of \( 6 \) cups of ice cream to make 8 ice cream sundaes. Therefore, the final answer is:
\[ \boxed{6} \]
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