Standard #: MAFS.2.OA.1.a (Archived 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: 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

Course Number1111 Course Title222
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 Resources

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
Creating a Balanced Equation

Students will relate using a balance to the mathematical symbol, the equal sign. Students will use their knowledge of the equal sign and addition and subtraction to find the unknown number in an equation with four or more numbers.

The Mystery Of The Missing Number

This lesson uses a fun math mystery theme to help your students determine an unknown whole number to balance an equation.

Into the Unknown...

This lesson begins with a learning scale to determine where students believe they are in regard to determining unknown whole numbers in equations with four or more whole numbers. The teacher will then model solving unknowns in equations with 4 or more whole numbers using base 10 blocks. Students are then given the opportunity to practice the skill with a partner, and are asked to write to explain their work. The students will be engaged through the use of manipulatives, teacher questioning, and partner practice as they begin to work on solving unknowns in more complex equations than they may be used to.

Original Student Tutorial

Name Description
Balancing Act

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

Tutorial

Name Description
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.

Student Resources

Original Student Tutorial

Name Description
Balancing Act:

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

Tutorial

Name Description
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.



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