9.
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7 is a counting number. But I am not sure what a counting number number is!
That's the "square" of the number. With counting numbers, the square will always be another counting number.
No- not exactly. Negative integers are not counting numbers. Positive integers are identified with counting numbers. Many authors like to start with zero as a counting number.
Yes, and including zero.
If counting by twelves, the tenth number will be 120.