#### Answer

To multiply two numbers with the same sign, multiply their absolute values. The product will be positive since both numbers have the same sign.
(refer to the step-by-step part for an example)

#### Work Step by Step

To multiply two numbers with the same sign, multiply their absolute values.The product will be positive since both numbers have the same sign.
Example:
$(-3)(-9)$
Multiply their absolute values: $|-3| \times |-9| = 3 \times 9 = 27$
The product must be positive, so
$(-3)(-9)=27$