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# Multiplying Integers - PowerPoint PPT Presentation

Multiplying Integers. Lesson 2-4, p. 83. Rules. When multiplying integers with like (the same) signs, the product (answer) will be positive. EX.) negative x negative = positive positive x positive = positive 5 * 3 = ____ (-5) * (-3) = ____

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## PowerPoint Slideshow about 'Multiplying Integers' - rico

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### Multiplying Integers

Lesson 2-4, p. 83

• When multiplying integers with like (the same) signs, the product (answer) will be positive.

• EX.) negative x negative = positive

• positive x positive = positive

• 5 * 3 = ____

• (-5) * (-3) = ____

• When multiplying integers with different signs, the product (answer) will be negative.

• EX.) negative x positive = negative

• positive x negative = negative

• (-5) * 3 = ____

• 5 * (-3) = _____

• When multiplying more than two factors, count the number of negative integers:

• *If you have an odd number of negative integers, then your product (answer) will also be negative.

• *If you have an even number of negative integers, then your product (answer) will be negative.

• TRY THESE:

• Negative Positive Positive Negative

• Sometimes you will be asked to simplify. Sometimes you will be asked to evaluate.

• When asked to simplify, you will not be able to solve the problem out to a numerical answer. Your answer will have a variable in it.

• EXAMPLE: 3a * (-5b) = -15ab

• When asked to evaluate, you need to substitute each variable for the values given and solve based on the rules for multiplying integers.

• Be careful to substitute what is given for each value.

• EXAMPLE: x = -4, y = 3

-xy = 12

- (-4) * 3

4 * 3 = 12