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Integers
What????
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Integers+
+
-
-
An integer is a whole number (not a fraction) that can be positive, negative, or zero. Therefore, the numbers 10, 0,
-25, and 5,148 are all integers.
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IntegersKnow the signs
+ Positive (If it has NO sign, it is
POSITIVE.)
- Negative (AKA: opposite of)
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Integers-
+
+
-
In order from least to greatest
-25, -5, -2, 0, 10, 51, 78
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Integers+
+
-
-
Correct order from least to greatest?
5, -1, -5, 1, 11, -11, 0
-11, -5, -1, 0, 1, 5, 11
The correct order is…
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Adding
Think MONEY!!
$$$$ $$$$
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AddingSigns the same??Add and keep the
signs+2 + +3 = -2 + -3 =
+5-5
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Think MONEY!!
Sue has $2. Nancy gives her $3. Has much does Sue have now?
+2 + +3 = +5
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Think MONEY!!
Sue owes $2. She needs to pay Miss Dixson $3. How much does Sue owe now?
-2 + -3 = -5
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AddingSigns different??Actually subtract
Keep the sign of the “larger” number
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AddingSigns different??
+2 + -3 = -1(3 - 2 =1 Use the
sign of the 3 because 3 is larger than 2)
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AddingSigns different??
Sue wrote a check for $2. Billy gave Sue $3. How
much does Sue have now? -2 + +3 = +1
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Adding
Think MONEY!!$$$$ $$$$
Remember When
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SubtractingDo you already know how
add integers?
YES!
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Cool!
If you know how to add, you can also subtract.
Subtracting
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SubtractingChange the sign of the
2nd integer and add
That’s it! Easy, huh?
+2 - -3 = +5
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Subtracting
Change the sign of the 2nd integer and add
ALWAYS the 2nd integer
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SubtractingChange the sign of the 2nd
integer and add (Now it is just like what we’ve done in the past.)
+2 - -3 =+5
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MultiplyingIf the signs are the same, the
product will be positive.
+ x + = + - x - = ++2 x +3 = +6-2 x -3 = +6
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MultiplyingIf the signs are different, the
product will be negative.
+ x - = - - x + = -
+2 x -3 = -6-2 x +3 = -6
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DividingIf the signs are the same, the result will be positive.
+ ÷ + = + - ÷ - = ++6 ÷ +3 = +2-6 ÷ -2 = +3
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DividingIf the signs are different, the result will be negative.
+ ÷ - = - - ÷ + = -
+6 ÷ -3 = -2-6 ÷ +3 = -2
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IntegersAren’t they
fun????