To find out how much sugar JoJo has left after using some for her cookies, we start with the total amount she had and subtract the amount she used.
- JoJo had \( 1 \frac{1}{2} \) cups of sugar, which can also be written as \( \frac{3}{2} \) cups in improper fraction form.
- She used \( \frac{3}{4} \) cup of sugar.
Now, we need to perform the subtraction:
\[ \frac{3}{2} - \frac{3}{4} \]
To subtract these fractions, we need a common denominator. The least common denominator (LCD) of 2 and 4 is 4. We convert \( \frac{3}{2} \) to have a denominator of 4:
\[ \frac{3}{2} = \frac{3 \times 2}{2 \times 2} = \frac{6}{4} \]
Now we can subtract:
\[ \frac{6}{4} - \frac{3}{4} = \frac{6 - 3}{4} = \frac{3}{4} \]
JoJo has \( \frac{3}{4} \) cup of sugar left.