She will be able to make 2 batches of brownies.If she has 1/2 cup of butter and the brownies take 1/4 cup,
we just need to see how many 1/4 are in 1/2.
This is a division problem.Therefore, we have 1/2 / 1/4
To do this, we multiply 1/2 by 4 and get 4/2 or just 2.
For your model, you could divide a square into 4 parts and show that it takes 2 of the 1/4 parts to make a 1/2.