Operations that undo each other include:
addition and subtraction
multiplication and division
powers and roots
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There is one operation like multiplication and division. Adding and subtraction is the same.
Inverse Operations: Divison undoes multiplication. Addition undoes subtraction. Subtraction undoes addition. Multiplication undoes division.
how does multiplication and division undo each other
If defined, they are inverse operations. However, multiplication and division is a somewhat flawed example because division by 0 is not defined. So, if you have a number x, then x*0 = 0 but 0/0 is not x: it is not defined.
Inverse operations, or opposite operations, undo one another. Subtraction undoes addition (and vice versa), and division undoes multiplication (and vice versa).
Multiplication and division are related because they are the inverse of each other. 9 x 4 = 36 36/4 = 9