Download Guided notes 1.2

Adding Integers
Section 1.2
Essential Question: Is the sum of two integers positive, negative, or zero? How can you tell?
Adding Integers with the same sign:
Words: Find the _______________. Then use the common sign.
Numbers:
2+ 5=
− 2 + (−4) =
− 6 + (−6) =
**** Same sign then find the ______________ and keep the _______________ _________________.
On Your Own:
Add.
1. 7 + 9=
2. −8 + (−9) =
3. 15 + 5 =
4.
− 9 + (−10) =
Adding Integers with Different Signs:
Words: Subtract the numbers, and then use the sign of the number with the highest
_______________________ value.
Numbers: 8 + (-10)=
-6 + 8=
-13 + 17=
****Different Sign find the __________________and use the sign of the number with the larger
________________________ _________________________.
On Your Own.
5. 5 + (−10) =
9. −2 + 11 =
6. − 3 + 7 =
7.
10. 9 + (−10) =
11.
− 12 + 13 =
4 + (−7) =
8. − 8 + 6 =
12.
5 + (−3) =
Additive Inverse Property:
Words: The sum of an _________________ and its ___________________ ___________________, or
___________________________, is 0.
Numbers: 12 + (-12)= 0
Algebra:
-7 + 7 =
6 + (-6) =
a + (- a) = 0
On Your Own.
13.
-11 + 11=
14.
50 + (- 50)=
Adding more than 2 integers:
The list shows 4 bank account transactions. Find the change C in the account balance.
July Transactions
Withdrawal
- $40
Deposit
$50
Deposit
$75
Withdrawal
- $50
Find the sum of the 4 transactions.
C = −40 + 50 + 75 + (−50)
On Your Own.
What if? In the above example, the deposit amounts are $30 and $40. Find the change C in the
account balance.