1. He ordered three pizzas.

2. He ordered three pizzaes.
3. He ordered three pizza.
4. He ordered thee pieces of pizza.

Which one is correct?

#s 1 and 4 are correct; 2 and 3 are incorrect.

#1 is referring to three whole pizzas, while #4 is referring to three sections of one pizza.

The correct sentence is: "He ordered three pizzas."

In this sentence, "pizzas" is the plural form of "pizza." When referring to multiple pizzas, we use the plural form "pizzas" instead of "pizza."

To determine the correct sentence, you can follow these steps:

1. Identify the subject of the sentence - in this case, "He."
2. Determine the verb - in this case, "ordered."
3. Identify the object of the verb - in this case, "pizzas."

To make the object "pizza" plural, we add an "s" at the end, resulting in "pizzas." This is because in English, plural nouns usually end in "s" or "es."

The other variations you provided in sentences 2, 3, and 4 are not correct:

- "He ordered three pizzaes" is incorrect because the plural form of "pizza" is "pizzas," not "pizzaes."
- "He ordered three pizza" is incorrect because it is missing the plural form of "pizza."
- "He ordered thee pieces of pizza" is incorrect because it misspells "three" as "thee" and uses "pieces of pizza" instead of the correct plural form "pizzas."

Therefore, the correct sentence is: "He ordered three pizzas."