there are 3 sizes of pizza, 4 types of crust, and 4 types of toppings. how many one topping pizzas can be made?

3*4*4, no?

To find the number of one topping pizzas that can be made, we need to multiply the number of choices for each of the three categories: size, crust, and toppings.

First, let's start with the number of choices for each category:
- Size: There are 3 sizes of pizza.
- Crust: There are 4 types of crust.
- Toppings: There are 4 types of toppings.

Now, we can multiply the number of choices for each category to find the total number of possible combinations:
3 (sizes) x 4 (crusts) x 4 (toppings) = 48.

Therefore, there are 48 different one-topping pizzas that can be made.

To arrive at this answer, you simply need to multiply the number of choices for each category together. This can also be visualized by organizing them as a table or a tree diagram.