Office Pro Plus Lesson Tutor Algebra Lesson 11 -
 

Objective(s):
Through the end of this lesson the student will probably be capable to:
identify any number's opposite
and have the ability to add a negative number to a positive one. Pre-Class
Assignment: Review/ completion of Algebra
Lesson 10
Resources/Equipment/Time Required:
Outline:
Additive Inverses are opposites.
Two numbers are opposites if their sum equals zero. For example,Purchase Office 2010, -8 and
8 are additive inverses because their sums total zero. This makes them
opposites.
Another way to write the
opposite of –8 is to write –(-8). To subtract a negative 8 is the same
as making it a positive 8, or finding its opposite.
You can do the same thing
with variables. For example,Microsoft Office 2010 Pro, -(-x) = x.
Using this principle, let's
add a negative number to a positive one: 8 + (-3) = 8 – 3 = 5. This could
be read as 8 plus a negative 3 OR 8 minus 3 OR 8 plus the opposite
of 3.
In algebra,Office Pro 2007 Key, subtracting a
number can also be described as adding its opposite.
For example,Office Ultimate 2007 Key, x – y = x +
(-y).
OR
8 – (-5) = 8 + 5 = 13


Now,Office Pro Plus, let's turn things around
a bit. Try this one:
14 – 28 = x
How can you rewrite that
to use what you've learned about opposites?
14 + (-28) = x
–14 = x


Let's try one more:
11 – (-3) – 4 = x
11 + 3 – 4 = x
14 – 4 = x
10 = x


Assignment(s)
including Answer key:


1. 5 – 7

2. 8 – (-10)

3. – 3 – 7

4. – 7 – 9

5. 7 + (-3)

6. 25 – 250

7. 5.8 – 2.3

8. 2.3 – 5.8

9. (34 – 13) – (15 – 17)

10. 11 – 5 – [6 + (-13)]



Answer key:

1. –2

2. 18

3. –10

4. –16

5. 4

6. –225

7. 3.5

8. –3.5

9. 23

10 .13
Pre-Requisite
To: Algebra Lesson
12


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