Think commute (like somebody who commutes to work), and then think of 'move around'. Addition and multiplication are commutative: X + Y is the same as Y + X.
A*B is the same as B*A (the * means to multiply) Subtraction and division are not commutative.
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Kadema's Rule
it's not about the answer is about the process
It means to tell what the formula is
A justification is a method of proving a rule for all situations given a set of parameters.
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