incredible integers
Post on 12-Nov-2014
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Incredible Integers
What is an integer?
Integers are the whole numbers
and their opposites.
Okay…but what does that mean?
Two integers are opposites if they are the same distance from 0 in
either the positive or negative direction on a
number line.
This means…• Positive integers
are all the whole numbers greater than zero: 1, 2, 3, 4, 5, ...
• Negative integers are all the opposites of these whole numbers: -1, -2, -3, -4, -5, …
• Negative numbers are less than zero.
Let’s look at some examples of opposites!
• -4 and +4
• -2 and +2
• -5 and +5
Integers can also represent situations
Here are some examples:
• Sarah went up four steps
• The temperature is twelve below zero.
• The elevation of the mountain is 52,000 feet
• +4
• -12
• +52,000
And a few more…
• The football team lost 8 yards
• Anne gained 10 pounds
• Tara spent $20 of her checking account.
• -8
• +10
• -$20
You try some!!• The stock market
showed a gain of 212 points today
• Death Valley, California is 282 feet below sea level
• The elevator went down two floors.
• +212
• -282
• -2
Now let’s talk about
Absolute Value
Absolute Value is…
The distance a number is from zero on the number
line.
So…• Absolute value is shown by two bars
on either side of an integer.
• The absolute value of the number is really just the number without a sign (or neither negative nor positive)
4
Unless…
• The negative sign is OUTSIDE of the absolute value bars.
= -4
Here are some examples!
• Example 1:
• Example 2:
= 9
Now you try some!
Time to practice!
Let’s look at the worksheets you just got!
Let’s go!!
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