Standard 2 : Demonstrate an understanding of equality and addition and subtraction.



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General Information

Number: MA.2.AR.2
Title: Demonstrate an understanding of equality and addition and subtraction.
Type: Standard
Subject: Mathematics (B.E.S.T.)
Grade: 2
Strand: Algebraic Reasoning

Related Benchmarks

This cluster includes the following benchmarks
Code Description
MA.2.AR.2.1: Determine and explain whether equations involving addition and subtraction are true or false.
Clarifications:
Clarification 1: Instruction focuses on understanding of the equal sign.

Clarification 2: Problem types are limited to an equation with three or four terms. The sum or difference can be on either side of the equal sign.

Clarification 3: Addition and subtraction are limited to sums up to 100 and related differences.

MA.2.AR.2.2: Determine the unknown whole number in an addition or subtraction equation, relating three or four whole numbers, with the unknown in any position.
Clarifications:
Clarification 1: Instruction extends the development of algebraic thinking skills where the symbolic representation of the unknown uses any symbol other than a letter. 

Clarification 2: Problems include having the unknown on either side of the equal sign.

Clarification 3: Addition and subtraction are limited to sums up to 100 and related differences. Refer to Situations Involving Operations with Numbers (Appendix A).



Related Access Points

This cluster includes the following access points.

Access Points

Access Point Number Access Point Title
MA.2.AR.2.AP.1: Determine if addition or subtraction equations with no more than three terms are true or false. Sums may not exceed 20 and their related subtraction facts.
MA.2.AR.2.AP.2: Determine the unknown whole number in an addition or subtraction equation, relating three whole numbers, with the change or result unknown (e.g., 7 + __ = 10, 10 − 3= __). Sums may not exceed 20 and their related subtraction facts.


Related Resources

Vetted resources educators can use to teach the concepts and skills in this topic.

Original Student Tutorial

Name Description
Balancing Act:

Help Tyler balance equations by finding the unknown number in this interactive tutorial.

Formative Assessments

Name Description
What Number Makes the Equation True?:

Students find the missing number in an equation relating four whole numbers.

Relating Four Whole Numbers:

Students find the missing number in an equation relating four whole numbers that involves addition and subtraction.

Determine the Missing Addend:

Students find the missing addend in an addition equation relating five whole numbers.

Lesson Plans

Name Description
Are Your Numbers Equal to My Numbers?:

This is a lesson that reinforces the meaning of the equal sign while students determine the unknown whole number in an addition equation.

Is it "Most Magically Magical"?:

This lesson is intended to be a cooperative inquiry-based activity used close to the end of second grade. The students will be actively engaged in adding and subtracting numbers within 100 while having fun completing Magic Squares.

Odds and Evens:

This resource helps students identify numbers as odd or even using a variety of methods including creating pairs, skip counting by two’s, using number lines, and arrays. It also leads them to understand that all even numbers can be written as a sum of equal addends and odds can be written as the sum of equal addends plus one.

This resource can be conducted as one lesson or can be spread over multiple mini sessions if needed as noted within this resource as Lesson 1 and Lesson 2.

 

Perspectives Video: Teaching Idea

Name Description
Equations on the Math Balance:

Unlock an effective teaching strategy for teaching inequalities and equations with the math balance in this Teacher Perspectives video for educators.



Student Resources

Vetted resources students can use to learn the concepts and skills in this topic.

Original Student Tutorial

Title Description
Balancing Act:

Help Tyler balance equations by finding the unknown number in this interactive tutorial.