The only difference is that whole numbers include 0 (zero), while natural numbers start with 1 (one). That's it!
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Between -10 and 10 there are 9 natural numbers if exclusive of the -10 and 10, or 10 if inclusive. The natural numbers are the positive integers starting with 1, ie {1, 2, 3, ...}.
Whole numbers are usually defined as the number 0,1,2,3,4,5,6.... where "...." means it goes on forever. These are the natural numbers with the number 0 added to them. So the natural numbers are 1,2,3,4,5,6...The integers are all the whole number and all the negatives of the natural numbers....-4,-3,-2,-1,0,1,2,3,4...So every whole number is an integer.Every natural number is an integer.Every integer is NOT a whole number. ( look at -2)Every integer is NOT a natural number. ( look at -3)The set of integers contains the set of natural numbers and contains the set of whole numbers.The set of whole numbers contains the set of natural numbers.
Zero is a member of the set of whole numbers. Some people include it in the set of natural numbers, some people don't.
If you have drawn a number line counting in whole numbers, the integers are those whole number points. Any decimal numbers in between are not integers.
The numbers 23 and 29 are the only prime numbers between 20 and 30