1. Add and subtract integers
Objective
Add and subtract integers

2. Rules for adding integers
Same Sign
2. Different Signs
Add numbers
Subtract numbers
Keep sign
Keep sign of largest number

3. Rules for subtracting integers
First change to addition then follow addition rules

4. Same sign add the absolute value of number 6 + 3
Evaluate the expression (-3)
Write the problem
(-3)
Draw arrows to signs & determine process to use
same
Same sign add the absolute value of number
6 + 3 -9 9
Keep the sign

5. Opposite sign subtract the absolute value of number 8 - 7
Evaluate the expression 8 + (-7)
Write the problem
8 + (-7)
Draw arrows to signs & determine process to use
Different
Opposite sign subtract the absolute value of number
8 - 7 1
Keep the sign of the largest number

6. Different signs subtract the absolute value of number 5 - 4
Evaluate the expression
Write the problem
Draw arrows to signs & determine process to use
different
Different signs subtract the absolute value of number
5 - 4 -1 1
Keep the sign of largest number

7. Draw arrows to signs to show what to do
Evaluate the expression
Write the problem
2 - 15 2 +
-15
Separate number and sign then insert a “+”
Draw arrows to signs to show what to do
opposite
15 - 2
Subtract
-13 13
Keep sign of largest number

8. 12 - (-6) 12 + 6 12 + 6 18 Evaluate the expression 12 - (-6)
Write the problem
12 - (-6)
Combine the 2 negatives to make positive
12 + 6
Draw arrows to signs to show what to do
same
12 + 6
Same signs add 18
Keep sign

9. Replace g with -2 and h with -7 -2 - (-7)
Evaluate the expression g - h if g = -2 and h = -7
Write the problem
g - h
Replace g with -2 and h with -7
-2 - (-7)
-2 + 7
Combine the two negatives to make a positive
different
Draw arrows to signs to show what to do

10. Different signs subtract
Evaluate the expression g - h if g = -2 and h = -7
-2 + 7
Different signs subtract
different
7 - 2
Keep sign of largest number +5 5