Multiplication and Sign Rules

The video tutorial explains how to determine if the result of multiplying several numbers is positive or negative. It begins with a simple multiplication example and then introduces a rule of thumb: if there is an even number of negative numbers, the result is positive; if odd, the result is negative. The tutorial concludes with a positive result for the given example.

What is the first step in determining if the result of a multiplication will be positive or negative?

• Multiply all numbers first.

• Determine the number of negative numbers.

• Check if the product is greater than 10.

• Count the number of positive numbers.

What is the product of 4, 2, and 3?

• 24

• 18

• 12

• 48

What is the result of multiplying 24 by 2?

• 52

• 50

• 46

• 48

According to the rule of thumb, what is the sign of the product if there is an even number of negative factors?

• Zero

• Undefined

• Positive

• Negative

If there is an odd number of negative factors, what will be the sign of the product?

• Undefined

• Positive

• Negative

• Zero