The document introduces adding integers using number lines and rules. It provides examples of using number lines to find the sum of integers with the same and different signs. The key rules for adding integers are: if the signs are the same, add the numbers and keep the same sign; if the signs are different, subtract the numbers and keep the sign of the larger number.

1. 1-4 Adding Integers
Learn to add integers.
Course 3

2. 1-4 Adding Integers
Additional Example 1A: Using a Number Line to Add
Integers
Use a number line to find the sum.
(–6) + 2
–6
2
–6 –5 –4 –3 –2 –1 0 1 2 3 4 5
You finish at –4, so (–6) + 2 = –4.
Helpful Hint
To add a positive number move to the right.
To add a negative number move to the left.
Course 3

3. 1-4 Adding Integers
Additional Example 1B: Using a Number Line to Add
Integers
Use a number line to find the sum.
–3 + (–6)
–6
-3
–9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2
You finish at –9, so –3 + (–6) = –9.
Course 3

4. 1-4 Adding Integers
Check It Out: Example 1A
Use a number line to find the sum.
(–3) + 7
–3
7
–6 –5 –4 –3 –2 –1 0 1 2 3 4 5
You finish at 4, so (–3) + 7 = 4.
Course 3

5. 1-4 Adding Integers
Check It Out: Example 1B
Use a number line to find the sum.
(–2) + 4
–2
4
–6 –5 –4 –3 –2 –1 0 1 2 3 4 5
You finish at 2, so (–2) + 4 = 2.
Course 3

6. Rules for Adding Integers
• If the signs are the same, add and keep
the same sign
-3 + (-14) = -17
• If the signs are different, subtract the two
numbers and keep the sign of the larger
number
-24 + 10 = -14

7. Rules for Adding Integers
• If the signs are the same, add and keep
the same sign
-3 + (-14) = -17
• If the signs are different, subtract the two
numbers and keep the sign of the larger
number
-24 + 10 = -14