Final answer:
To find the model that represents 33 1/3%, convert the fraction to a decimal and shade one-third of the whole model.
Step-by-step explanation:
To find the model that represents 33 1/3%, we need to first convert the fraction to a decimal. Since 1/3 is equal to 0.333333…, we can round it to 0.33. Then, we can find the model that represents 33 1/3% by shading one-third of the whole model.