warm- up 10-13-14 use pgs. 199 and 200 in your workbook. work on hands on activity 1 and 2
TRANSCRIPT
What are Integers?
• Integers are just whole numbersNumbers like 1 or
2Even like 2,153
• Integers can be negativeLike -3 or -5Even -3,403,69
• Integers are not decimals or fractions Not 4.5 or 2.1320421 Not 1/2 or 3/4
• Not negative decimals or fractions Not -2.3 or -98.576 Not -4/5 or -5/8
Adding with Color Counters
• Think of each Yellow Chip as positive 1• Think of each Red Chip as negative 1
1 -1
Each red chip cancels out a yellow chip– Think of it like money. A yellow chip is
money you earn (like allowance) and a red chip is money you spend (on Doritos)
+ = Nothin’ (You spent all your money on Doritos)
This goes for each chip. If we have 8 yellows and 8 reds, each red still cancels out a yellow.
+ =Still Nothing
Now you spent all 8 dollars you had on Doritos!
Oops… Let’s review
• Think of each Yellow Chip as positive 1• Think of each Red Chip as negative 1
1 -1
a.) OneYellow
b.) Two Yellows
c.) Two Reds
d.) Nothing!
Awesome! Next question…
3.) How much is left?
+ =
Starting Point• The first number in an addition
problem is your starting point• This is where you, the hiker, will stand
Example
Direction to Face
• The operation symbol tells us which direction to face. – Addition: Face Positive– Subtraction: Face Negative
Example
Where to Walk
• The last number tells us how many spaces to walk– Positive: Walk Forwards– Negative: Walk Backwards
Example
Now you give it a try…
1. Given this equation, which hiker is in the correct starting place?
-5 + 6 = ?
Very Good!Next. Using the same equation, which direction should you face?
-5 + 6 = ?
positivenegative
No, that’s not it… but why?
Addition: Face PositiveSubtraction: Face Negative
Hint: Look to see if there is a plus sign or a minus sign between numbers
Test Review
Turn 12.45% into a decimal and a fraction.
•Use place value to determine your denominator for the fraction. •Simplify your answer.