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.

Related Access Points

This cluster includes the following access points.

Access Points

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.

Formative Assessments

What Number Makes the Equation True?:

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

Type: Formative Assessment

Relating Four Whole Numbers:

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

Type: Formative Assessment

Determine the Missing Addend:

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

Type: Formative Assessment

Lesson Plans

Determine the Unknown in an Equation:

Students will apply their understanding of the equal sign as a relational symbol to determine the unknown number in equations relating four whole numbers. Students are encouraged to explore a variety of strategies for equations with addition or subtraction on each side of the equal sign.

Type: Lesson Plan

The Mystery Of The Missing Number:

In this lesson, students will find the “mystery” (missing) number in an addition or subtraction equation relating 4 whole numbers with the unknown in any position. Students will complete an activity in partners, using hint cards as needed.

Type: Lesson Plan

Into the Unknown:

In this lesson, the teacher will introduce using base ten blocks to solve addition equations relating 4 whole numbers with the unknown in any position. Students are given the opportunity to practice with a partner. The students will be engaged with manipulatives, teacher questioning, and partner practice as they determine the unknown number.

Type: Lesson Plan

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.

Type: Lesson Plan

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.

Type: Lesson Plan

Original Student Tutorial

Balancing Act:

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

Type: Original Student Tutorial

Perspectives Video: Teaching Idea

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.

Type: Perspectives Video: Teaching Idea

Student Resources

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

Original Student Tutorial

Balancing Act:

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

Type: Original Student Tutorial

Parent Resources

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