Vocab
Adding Integers
Subtracting Integers
Mix
Misc.
100
Absolute Value
The distance of a number from zero
100
-5 + 9
4
100
-4 - 6
-10
100
-2 - 3
-5
100

How do you know the correct sign to use when you add a positive and negative number?

You take the sign of the bigger number.

200
Integer
The set of whole numbers and their opposites.
200
-12 + 5
-7
200
4 - 11
-7
200
-10 + 30
20
200

What do you have to do to the subtraction symbol in an integer problem?

Turn it into an addition symbol.

300
Opposite
The opposite of a number is the same distance from zero as the original number just on the other side.
300
-16 + (-17)
-33
300
15 - (-7)
22
300
21 - (+5)
16
300

What number is neither positive or negative?

0
400
|-6|
Absolute value of -6 = 6
400
How do you find the sum of numbers with different signs
Subtract and take the sign of the bigger number
400
-27 - (-3)
-24
400
Subtracting a negative is the same thing as...
Adding a positive
400

-9 + 6 - 2

-5

500
6 and -6
Opposites
500
-16+18+-17
-15
500
-10 - 11 - (-3)
-18
500
-10 + (-2) - 5
-17
500

Bob solved the problem -4 - (-2).  He changed the subtraction into an addition problem and turned 4 into a positive number.  He got 2.  Is he correct? Explain.  

He is not correct he should have gotten -2.  The four does not change.  He did make the problem an addition problem, but he did not change the sign of the second number which should have been -4 + 2.  Since they are opposite signs we subtract and keep the sign of the bigger number.  

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