The simple answer is that they are two of the basic algebraic functions (along with exponentiation). Division and subtraction are just the opposites of these so are different.
Multiplication and addition are also similar because repeated addition is the same as multiplication (and repeated multiplication is exponentiation).
The full answer is part of what is known as Algebraic Fields and shows how these functions relate to each other and to different systems of number.
basically he said cuz they both increase the original value while division and subtraction decrease it
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numbers with Like signs : result Plusnumbers with Unlike signs : result Minus
you must take the sign of the bigger number
The sign of multiplication is x or *
Just type the letter x. example:5x8=40 the multiplication sign was x.
In multiplication/division the answer will always be negative and in addition/subtract the answerwill have the sign of the larger number