Properties of Addition

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) 4 + 2 = 6 _______________ 2) 8 + 3 = 11 _______________

Using the Commutative Property What is another way to write these addition sentences? 1) 5 + 6 = 11 2) 8 + 4 = 12

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 = 9 3 + n = 9 n + 5 = 7 5 + n = 7 23 + n = 25 45 + n = 45

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

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

Using the Identity Property Let’s try it…. 18 + 0 = 0 + 203 = 3 + 0 =

Challenge of the Day! Attempt at your own risk!