Milk mathematics!

Each morning, our milk is delivered to us in a box .
We are learning lots of maths each day when our milk arrives in Room 15. Torrin is counting how many columns there are.
What happens if Mrs Loudon turns the carton around ? How many columns will there be then? 
How many ways can you count the milk . 
We will have enough milk for all the children!
How many children in the class?