Standard #: MAFS.1.OA.2.4 (Archived Standard)


This document was generated on CPALMS - www.cpalms.org



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: 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
Date of Last Rating: 02/14
Status: State Board Approved - Archived

Related Courses

Course Number1111 Course Title222
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 Resources

Formative Assessments

Name Description
Using Inverse Operations

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

Two Students' Strategies

Students examine two related strategies to solve a subtraction problem.

Using Addition to Solve Subtraction Problems

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

Use Addition to Solve Subtraction

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

Lesson Plans

Name Description
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.

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.

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.

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.

Printed On:4/28/2024 5:19:00 AM
Print Page | Close this window