Lesson 2-4 Pages 75-79

Multiplying Integers

What you will learn!1. How to multiply integers.

2. How to simplify algebraic expressions.

What you really need to know!

The product of two integers with different signs is negative.

The product of two integers with the same sign is positive.

Example 1:

Find each product:

8(-12) = -96

-9(11) = -99

Example 2:

Find the product:

-4(-16) = 64

Example 3:

Find the product:

-7(11)(-2) = 154

Example 4:

A student missed only 4 problems on a test, each worth 20 points. What is the total number of points missed?

A. -5 B. -20 C. 24 D. -80

Example 5:

Simplify: -7(6k)

(-7•6)k

-42k

Example 6:

Simplify:8a(-5b)

(8•-5)ab

-40ab

Example 7:

Evaluate: -3xy if x = -4 and y = 9

-3(-4)(9)

108

Page 77

Guided Practice

#’s 4-15

Pages 75-77 with someone at home

and study examples!

Read:

Homework: Pages 78-79

#’s 16-54 even

#’s 59-85

Lesson Check 2-4

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Lesson 2-4

Lesson Check 2-4