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Yes, because natural numbers are your counting numbers (1,2,3,4...) Whole numbers are natural numbers and zero (0,1,2,3...) and integers are all of the natural numbers and their opposites and zero (...-3,-2,-1,0,1,2,3...).
A zero pair
1to9 are counting numbers Counting numbers are positive whole numbers and not zero. They can also be called 'natural numbers'. They are so called because when you count, you start at +1, then +2, +3 and continue on in this... That would be zero, and negative integers. "Counting numbers" refers to integers (whole numbers) that are positive (larger than zero).
Yes it is No. Negative numbers are not counting numbers. Nor is zero.
Traditionally, counting numbers start from 1.