In this unit, students will continue to develop their understanding of equations and equivalence. Students are introduced to the concept of that equations can be true or false. They also use symbols for comparisons and missing numbers. Students may have difficulty moving past limited prior understandings of equations and the use of the equals sign.
Key Concepts:
 True equations show the same value on either side of the equals sign. (An equation says that the quantities on either side of the equals sign are the same. An equation is true if the quantities on either side of the equal sign are the same, and false if they are not.)
 The unknown number in an equation will make the equation true.
 Symbols can be used to compare numbers. (We can use the < and > symbols to compare quantities that are not equal.)
Prior Knowledge Needed:
 Understand the meaning of the equal sign; (Grade 1, Unit 9; 1.OA.D.7)
 Compare two twodigit numbers based on meanings of the tens and ones digit; (Grade 1, Unit 8; 1.NBT.B.3)
 Add and subtract within 20; (Grade 1, Unit 9; 1.OA.C.6)
Units on the Horizon:
 Demonstrate proficiency in addition and subtraction situations; (Grade 1, Unit 18)
 Expressing and comparing three digit numbers; (Grade 2, Unit 7)
 Relating skip counting to mental addition and subtraction; (Grade 2, Unit 8)
Lessons

Lesson objective: Understand that an equation will be true if both sides of the equals sign have the same value, and false if the two sides have differing values. Students bring prior knowledge of the meaning of the equals sign from Grade 1, Unit 9, 1.O...

Lesson objective: Add and subtract to determine if equations are true or false. This lesson helps to build fluency with comparing values on both sides of the equals sign. Balances, ten strips, and connecting cubes are used here because they allow studen...

Lesson objective: Apply knowledge of comparing sides of the equals sign to determine if equations are true or false. This lesson provides an opportunity for students to apply their knowledge and understanding of true and false equations to a mathematica...

Lesson objective: Understand that symbols may be used in an equation to represent a missing number. Students bring prior knowledge of unknown numbers in equations from Grade 1, Unit 9, 1.OA.A.1. This prior knowledge is extended to include the use of sym...

Lesson objective: Apply understandings of symbols within equations and the meaning of the equals sign to find unknown numbers and create true equations. This lesson helps to build fluency with finding unknown numbers in equations. The game Fish Bowl is ...

Lesson objective: Apply understandings of symbols within equations and the meaning of the equals sign to find unknown numbers and create true equations. This lesson helps to build fluency with finding unknown numbers in equations. Twosided counters are...

Lesson objective: Apply understandings of symbols within equations and the meaning of the equals sign to find unknown numbers and create true equations. This lesson provides an opportunity for students to apply their knowledge and understanding of symbo...

Lesson objective: Understand that two numbers can be compared using the symbols =, >, and <. Students bring prior knowledge of comparing two twodigit numbers from Grade 1, Unit 8, 1.NBT.B.3. This prior knowledge is extended to include the use of ...

Lesson objective: Compare two twodigit numbers using a < or > symbol. This lesson helps to build fluency with twodigit comparisons. The game Ocean World is used here because it supports place value connections. This work develops students' under...

Lesson objective: Apply understanding that two twodigit numbers can be compared using the symbols < or >. This lesson provides an opportunity for students to apply their knowledge and understanding of using symbols to compare numbers to a mathema...