Kathy is baking cakes. If each cake requires #1/12# of a teaspoon of vanilla, and she has #9/12# of a teaspoon, how many cakes can she bake?
She can bake
Assuming she has enough of the other ingredients, the amount of vanilla is the limiting factor.
She can use it up
How many portions of
By observation and reasoning we can see it is
However, other questions might not be as obvious, so let's look at the math as well. We need to do a division operation...
[note that in this case you can also just divide straight across because you get an exact answer for both]