Download Lesson 2.5 Multiplying Real Numbers ppt

Lesson 2.5
Multiplying Real Numbers
Mr. Sparks & Mr. Beltz
Goal:

Multiply real numbers using
the rule for the sign of a
product.
Product Rules of a Signed
Number
The product of two numbers with the same
sign is POSITIVE
The product of two numbers with different
signs is NEGATIVE
*Even amount of negative signs= positive
*Odd amount of negative signs= negative
Examples of Product Rule
A.
-4(5) = -20 One negative factor=
negative.
B.
-2(5)(-3)= 30 Two negative factors=
positive
C.
-10(-0.2)(-4)= -8 Three negative
factors= negative
D.
4
(-2) = 16 Four negative factors=
positive
P.93 #1-4

1) 3(-5)= -15

2) -2(4)(5)= -40

3) -1/3(-3)(-2)= -2

3
4) (-2) = -8
Practice
P.96
#17-30, 41-45