Is there a difference between using "number" and "numbers" when referring to multiple numbers?
For example, when calling a merchant to inquire about multiple orders, should I say:
I need RMAs for order numbers 1 and 2.
I need RMAs for order number 1 and 2.
This question might sound stupid, but I'm not sure what the main subject is. Is "number" the subject and therefore should I use "numbers"? Or are the order numbers (1 and 2) the subject, so should I keep "number" singular?