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.

Examples

Determine the unknown in the equation begin mathsize 12px style 45 plus square equals 23 plus 46 end style.

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).

General Information
Subject Area: Mathematics (B.E.S.T.)
Grade: 2
Strand: Algebraic Reasoning
Status: State Board Approved

Related Courses

This benchmark is part of these courses.
5012040: Mathematics - Grade Two (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current))
7712030: Access Mathematics Grade 2 (Specifically in versions: 2014 - 2015, 2015 - 2018, 2018 - 2022, 2022 and beyond (current))
5012005: Foundational Skills in Mathematics K-2 (Specifically in versions: 2019 - 2022, 2022 and beyond (current))

Related Access Points

Alternate version of this benchmark for students with significant cognitive disabilities.
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 benchmark.

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

Original Student Tutorial

Balancing Act:

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

Type: Original Student Tutorial

MFAS Formative Assessments

Determine the Missing Addend:

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

Relating Four Whole Numbers:

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

What Number Makes the Equation True?:

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

Original Student Tutorials Mathematics - Grades K-5

Balancing Act:

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

Student Resources

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

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 benchmark.