Negative one times any number is equal to the opposite of that number.Negative one times negative one is positive one.
-from wikipedia
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The multiplication properties are: Commutative property. Associative property. Distributive property. Identity property. And the Zero property of Multiplication.
division property of equality or multiplication property, if you multiply by the reciprocal
If a < b, and c is positive, then ac < bcIf a < b, and c is negative, then ac > bc(inequality swaps over!)
The multiplication property of identity
Identity property of multiplication.