ADDING

1
ADDING SUBTRACTING INTEGERS

• OBJECTIVE
• I will evaluate an expression containing
  variables by substituting rational numbers
  (INTEGERS) for the variables.
• I WILL ADD SUBTRACT INTEGERS.

2
INTEGER ADDITION RULES

• Same sign, add keep
• Different sign, subtract
• Take the sign of the higher
• Then itll be exact.

• Can you sing it to THE TUNE ROW,ROW,ROW YOUR
  BOAT?

3
Lets practice! You have 5 secondstake out
your whiteboard, expo marker, and felt eraser.
4
Lets practice! Solve the Problems

• -3 -5
• -4 7
• 3 (-4)
• -6 -7
• -5 9
• -9 -9

-8
3
-1
-13
4
-18
5
Integer Subtraction Rule
KEEP (the sign of the 1st number) CHANGE
(the sign of the 2nd number) CHANGE (the
operation to )
2 (-7) is the same as 2 (7) 2 7 9!
6
Lets practice! You have 3 secondstake out
your whiteboard, expo marker, and felt eraser.
7
Lets practice! Solve the Problems

• -3 (-5)
• 4 - 7
• (3) - (-4)
• -6 (-7)
• 5 - 9
• -9 (-9)

2
-3
1
1
-4
0