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Whole numbers are numbers that do not have important decimal places present or any fractions associated with it. The number 14 is a whole number and the whole number after it is 15 and the whole number before it is 13.
Because understanding rational and whole numbers and in particular prime numbers it is useful when finding the lowest common multiple or the highest common factor of numbers.
Whole numbers are a proper subset of decimal numbers. All whole numbers are decimal numbers but not all decimal numbers are whole numbers.
Different whole numbers are always whole numbers, but I suspect you meant to ask about the difference between whole numbers. You can subtract two whole numbers and get a negative result. Whole numbers can't be negative.
No. Natural numbers are a subset of whole numbers. Negative numbers are whole numbers but not natural.