Amsco Integrated Algebra I: Multiplication of Signed Numbers
 This is a free lesson from our course in Amsco's Integrated Algebra

 This lesson explains how to multiply numbers with same and opposite signs using the properties of real numbers. To multiply two signed numbers: • find the product of the absolute values. • write a plus sign before this product when the two numbers have the same sign. • write a minus sign before this product when the two numbers have different signs. (More text below video...)
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 (Continued from above) The laws of signs may be combined as follows: Minus times plus is minus; plus times minus is minus; minus times minus is plus; plus times plus is plus. For example to multiply: -2(3) (-4) (5) (-6) Taking the signs in pairs, the minus on the 2 times the plus on the 3 produces a minus. This minus times the minus on the 4 produces a plus. This plus times the plus on the 5 produces a plus. This plus times the minus on the 6 produces a minus, so the final answer is negative. The product of the numbers, disregarding their signs, is 720; therefore, the final answer is -720. The video above will explain in detail with the help of several examples.

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