Addition and Subtraction with Whole Numbers

A student uses the counting on strategy for adding two numbers. He says "fifteen, sixteen, seventeen, eighteen". What two numbers is he adding?

• 15 + 1

• 15 + 18

• 15 + 4

• 15 + 3

What property is represented by 3 + 4 = 4 + 3?

• Associative Property of Addition

• Commutative Property of Addition

• Closure Property of Addition

• Identity Property of Addition

What property is represented by 8 + 0 = 8?

• Associative Property of Addition

• Commutative Property of Addition

• Closure Property of Addition

• Identity Property of Addition

What property is represented by (3 + 4) + 5 = 3 + (4 + 5)?

• Associative Property of Addition

• Commutative Property of Addition

• Closure Property of Addition

• Identity Property of Addition

What property is represented by 5 + (4 + 3) = (4 + 3) + 5?

• Associative Property of Addition

• Commutative Property of Addition

• Closure Property of Addition

• Identity Property of Addition

Which model of subtraction is represented here?

• Take-Away

• Missing Addend

• Comparison

• Number Line

Which model of subtraction is represented here?

• Take-Away

• Missing Addend

• Comparison

• Number Line

Which model of subtraction is represented here?

• Take-Away

• Missing Addend

• Comparison

• Number Line

What property also holds under subtraction?

• Associative Property

• Commutative Property

• Closure Property

• Identity Property