MAFS.2.OA.1.aArchived Standard

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Determine the unknown whole number in an equation relating four or more whole numbers. For example, determine the unknown number that makes the equation true in the equations 37 + 10 + 10 = ______ + 18, ? – 6 = 13 – 4, and 15 – 9 = 6 + square box.
General Information
Subject Area: Mathematics
Grade: 2
Domain-Subdomain: Operations and Algebraic Thinking
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Represent and solve problems involving addition and subtraction. (Major Cluster) -

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Date Adopted or Revised: 02/14
Content Complexity Rating: Level 2: Basic Application of Skills & Concepts - More Information
Date of Last Rating: 08/14
Status: State Board Approved - Archived

Related Courses

This benchmark is part of these courses.
5012040: Grade Two Mathematics (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 - 2024, 2024 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 - 2024, 2024 and beyond (current))

Related Access Points

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

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

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

Original Student Tutorial

Balancing Act:

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

Type: Original Student Tutorial

Tutorial

Understanding the Meaning of the Equal Sign:

In this tutorial, you will learn more about what the equals sign means and how to balance equations.

Type: 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

Tutorial

Understanding the Meaning of the Equal Sign:

In this tutorial, you will learn more about what the equals sign means and how to balance equations.

Type: Tutorial

Parent Resources

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