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 Interactive Checkpoint
 Natural Numbers:  The set of numbers 1, 2, 3, 4, ... Also called counting numbers.

Determine which of the following numbers are natural numbers.

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Graded Response

 a) 2/3  a)
 b) 23  b)
 c) 23000000000000  c)
 d)  d)
 e) -3  e)