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1. 2.3 Subtract Real Numbers

2. fguilbert
Review of Addition Rules
Same signs ADD. Keep Sign
+ + + = + 3 + 5 = 8
- + - = - -3 + -5 = -8
Different signs - choose a sign
Then SUBTRACT.
+ + - = ? + 4 + - 5 = - 1

3. fguilbert
To subtract, add the opposite
- 4 - 7 change to addition
- 4 + - 7 now use addition rules
- 11 choose - then add
-5 - - 6 change the problem
-5 + + 6 now use addition rules
+ 1 choose + then subtract

4. fguilbert
Try these
9 - 10
7 - 4
2 - - 4
-3 - + 4
- 8 - 7
-1
3
+6
-7
-15
9 + - 10
7 + - 4
2 + + 4
-3 + - 4
- 8 + - 7

5. 2 + - 4 =
-2 =
( 2 ) =
2 + -4 =
2 + 4 =
6
ex1
ex2

6. fguilbert
Evaluate a + ( - b)
When a = -3 b = -5
a + (- b )
Replace variables with ( )
then substitute with numbers.
( ) ( )
-3 -5

7. fguilbert
( ) ( )
-3 -5
+ (- )
-3 + + 5 = 2
-3 + -5 is NOT
The same
a + ( - b)
a = -3 b = -5

8. fguilbert
Thought for the day
He who controls others may be
powerful, but he who has
mastered himself is mightier
still. -
Lao -Tzu