1. Equivalent Number Sentences, Equals Sign Means Equality __ + __ = __ - __ 27 + 17 = 50 - 6 Addition and Subtraction 22 Patterns and Algebra 19

2. Equivalent Number Sentences, Equals Sign Means Equality 87 = 36 3 = 6 - 3 Addition and Subtraction 22 Patterns and Algebra 19

3. Equivalent Number Sentences, Equals Sign Means Equality 87 - 51 = 36 - 1 - 50 36 37 87 Addition and Subtraction 22 Patterns and Algebra 19

4. Equivalent Number Sentences, Equals Sign Means Equality 87 = 36 + 51 + 1 + 50 36 37 87 Addition and Subtraction 22 Patterns and Algebra 19

5. Equivalent Number Sentences, Equals Sign Means Equality What numbers could we use to create a number sentence? How could we create a number sentence using these cards? What does your number sentence say? Is your number sentence true? How could you make your number sentence true? The numbers I used to create a number sentence are … I created a number sentence using cards by … My number sentence says... My number sentence is / is not true because both sides are / are not equal. I made my number sentence true by adding / subtracting … Addition and Subtraction 22 Patterns and Algebra 19