MAFS.1.OA.2.4Archived Standard

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Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
General Information
Subject Area: Mathematics
Grade: 1
Domain-Subdomain: Operations and Algebraic Thinking
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Understand and apply properties of operations and the relationship between 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: 02/14
Status: State Board Approved - Archived

Related Courses

This benchmark is part of these courses.
5012030: Mathematics - Grade One (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current))
7712020: Access Mathematics Grade 1 (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.

Related Resources

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

Formative Assessments

Using Inverse Operations:

Students identify an addition equation that can be used to solve a subtraction problem.

Type: Formative Assessment

Two Students' Strategies:

Students examine two related strategies to solve a subtraction problem.

Type: Formative Assessment

Using Addition to Solve Subtraction Problems:

Students use the relationship between addition and one subtraction to solve a subtraction equation.

Type: Formative Assessment

Use Addition to Solve Subtraction:

Students are given a subtraction problem and asked to solve the problem using a related addition fact.

Type: Formative Assessment

Lesson Plans

Let’s Find the Missing Addend:

This lesson will strengthen student understanding of the relationship between addition and subtraction equations. Students will use counters and part-part whole boards to model restating subtraction equations as addition equations with a missing addend.

Type: Lesson Plan

Help Amelia Bedelia Look for the Missing Addend:

This lesson introduces the relationship between the related subtraction and addition in fact families and helps students understand that they can use the missing addend to help find the difference in related subtraction problems.

Type: Lesson Plan

Mystery Bag to 12:

This lesson deals with finding an unknown number in a subtraction equation by thinking addition and counting on. It utilizes the part-part-whole organizer and manipulatives to support the learning of students.

Type: Lesson Plan

Thinking Addition to Solve Subtraction Problems:

Students will use the knowledge of Sums of Ten and apply that skill to solve related subtraction problems. Students will learn the strategy Thinking Addition to solve subtraction problems.

Type: Lesson Plan

MFAS Formative Assessments

Two Students' Strategies:

Students examine two related strategies to solve a subtraction problem.

Use Addition to Solve Subtraction:

Students are given a subtraction problem and asked to solve the problem using a related addition fact.

Using Addition to Solve Subtraction Problems:

Students use the relationship between addition and one subtraction to solve a subtraction equation.

Using Inverse Operations:

Students identify an addition equation that can be used to solve a subtraction problem.

Student Resources

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

Parent Resources

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