7. POSITIVE NEGATIVE
When the temperature
is above zero
When you are above
ground
When you earn money
In hockey, when your
team scores a goal while
you are on the ice
When the temperature
is below zero
When you are below
ground
When you spend money
In hockey, when the
other team scores a goal
while you are on the ice
8.
9. Positive integers increase in increments of one
as you move to the right
Negative integers mirror this moving to the left
of zero, however, even though they appear to
be getting bigger, they are actually getting
smaller
-5 is one number smaller than -4, for example
10. You already know how to
add positive integers…you
just haven’t called them
integers before!
11. 5 + 3 = 8
You just added the integers
positive 5 and positive 3 and
found out the answer was
positive 8!
12. Adding negative integers is just like adding
positive integers…only difference…the answer
will have a negative sign
-6 +(-5) = -11
All you do is ignore the negative signs and add
the numbers, then put the negative sign back in
your answer
THIS ONLY WORKS IF BOTH NUMBERS
ARE NEGATIVE!!
13.
14. On the previous slide we saw a diagram of the
problem 6 + (-2)
To solve this, they started at zero and moved to
the right 6 places – to represent the positive 6
Next, they moved left 2 places – this
represented the -2
They landed on the number 4 (positive 4)
which is the answer
15. Using a number line is a great way to practice
when you are first learning to add numbers
with different signs – but there is another way
We can use the absolute value of a number and
subtraction to solve addition problems
involving integers of different signs
16.
17. Absolute value is the distance
between a number and zero
It does not matter which direction
you are moving to get back to zero –
all that is important is how many
steps it takes to get there
18. It is written as vertical lines on either
side of a number
|12|, is 12
|-23|, is 23
Absolute values are ALWAYS
positive
19. Here’s how with the help of absolute value…
1) find the absolute value of each number being
added
2) subtract the smaller absolute value from the
larger absolute value
3) the sign of the number with the larger
absolute value is the sign of the answer
21. All photos from flickr.com, all have a creative commons license
Slide 2: Photographer: Ciccio Pizzettaro
Title: Question Mark Taken: 1/23/2010
Slide 3: Photographer: Kenyee
Title: Floating Integers Taken: 8/22/2008
Slide 6 Photographer Rob Friesel found_drama
Title: Is that a…positive integer? Taken: 1/25/2013
Slide 6: Photographer: Frank Wales
Title: I should have quit while I was ahead Taken:
11/19/2007
