A subtraction story could be talking about items being taken away, and asking how many are left. Another subtraction story could compare two different amounts and ask 'how many more' one is than the other.
An addition story would talk about a starting amount, then a certain amount are added, and ask how many are there now.
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They are different in the same way that subtraction of integers is different from their addition.
Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.
Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.
P.E.M.D.A.S Parenthesis..( ) Exponants Multiplication Division Addition Subtraction Do Multiplication and Division left to right. Do the same to Addition and Subtraction.