1. Properties of Addition

2. What is another way to write these addition sentences?
Commutative Property
The order of the numbers does not affect the sum.
Examples:
What is another way to write these addition sentences?
1) = _______________
2) = 11 _______________

3. Using the Commutative Property
What is another way to write these addition sentences? 1) = 11 2) = 12

4. Examples: (Solve for n)
Commutative Property
What is a variable?
What happens when a variable is used in
place of a number? n + 3 = 6
Examples: (Solve for n)
1) n + 3 = n = 9
n + 5 = n = 7
23 + n = 25
45 + n = 45

5. Using the Commutative Property
Solve for n. 1) n + 6 = n = 11 2) n + 4 = n = 12 3) 6 + n = 10 4) 3 + n = 4

6. Identity Property
When zero is added to a number, the sum is the number.
Examples:
= 21
0 + 1,964 = 1,964

7. Using the Identity Property
Let’s try it…. = =
3 + 0 =

8. Challenge of the Day!
Attempt at your own risk!