It’s just the way the math works out.
If you have 2 books, and then you get 2 more books you have 4 books.
But if you have 2 groups of 2 books… well that is exactly the same as what you had above so you have 4 books still.
It doesn’t work like that for any other numbers because it isn’t the same thing.
3*3 isn’t 3+3, but it is 3+3+3. 3 groups of 3.
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