Hey there!
In order to find how many batches of cookies Sue can make with 9 cups of flour, all you need to do is divide 9 by 1 1/4. Not sure if you've gotten into decimals yet, but I would use those instead of fractions if you have.
Here's how you solve with fractions:
[tex] \frac{9}{1} / 1 \frac{1}{4} [/tex]
Make this easier on yourself and turn your whole number into an improper fraction.
[tex] \frac{9}{1} / \frac{5}{4} [/tex]
When you divide fractions, you will flip the second fraction (also called taking the reciprocal of the fraction). Then, you can multiply your fractions together instead.
[tex]\frac{9}{1} * \frac{4}{5} [/tex]
Now, just multiply across and simplify.
[tex]\frac{36}{5} [/tex]
[tex]7 \frac{1}{5} [/tex]
Since you can't make a full batch with a fifth of the flour needed, Sue will be able to make 7 batches.
Hope this helped you out! :-)
