Standard #: MAFS.1.OA.4.8 (Archived Standard)


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Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = [] – 3, 6 + 6 = [].


General Information

Subject Area: Mathematics
Grade: 1
Domain-Subdomain: Operations and Algebraic Thinking
Cluster: Work with addition and subtraction equations. (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
Unknowns In Word Problems

Students are read a word problem and given an equation that matches the problem, and then asked to solve for the unknown in the equation.

What Is the Missing Number?

Students are given equations and asked to find missing numbers.

Unknowns In Equations

Students are asked to find the unknown in three different equations and explain their reasoning.

Find the Missing Number

Students are given equations with a missing number and asked to find the missing number.

Lesson Plans

Name Description
The Whole Part

Students will participate in a variety of activities and use part-part-whole graphic organizers to discover unknown addends in put together addition situations.

Make Mine Equal

Students will explore the meaning of the equal sign by creating and completing equations that have two addends on each side of the equation. Note that this lesson focuses on addition equations, though it can easily be adapted to include subtraction equations.

Ladybug Missing Numbers

This lesson will introduce the concept of determining missing numbers in addition equations.

Problem-Solving Tasks

Name Description
Find the Missing Number

This task asks students to solve addition and subtraction equations with different structures so that they are able to see the connections between addition and subtraction more easily. Examples should be presented with the the sum or difference on either side of the equal sign in order to dispel the notion that = means "compute."

Kiri's Mathematics Match Game

In all versions, students must engage basic addition and subtraction facts. In the memory version, after a student has turned over one card, in order to know whether there is a match using cards they've seen, they need to to solve equations of the form ?+b=c, b+?=c, ?-b=c, and b-?=c.

Tutorials

Name Description
Subtraction - Using Equations and Symbols to Find an Unknown

In this tutorial, you will learn to use symbols to record an unknown whole number in a subtraction equation relating to three whole numbers.

Addition - Using Equations and Symbols to Find an Unknown

In this tutorial, you will learn to use symbols to record an unknown whole number in an addition equation relating to three whole numbers.

Student Resources

Problem-Solving Task

Name Description
Find the Missing Number:

This task asks students to solve addition and subtraction equations with different structures so that they are able to see the connections between addition and subtraction more easily. Examples should be presented with the the sum or difference on either side of the equal sign in order to dispel the notion that = means "compute."

Tutorials

Name Description
Subtraction - Using Equations and Symbols to Find an Unknown:

In this tutorial, you will learn to use symbols to record an unknown whole number in a subtraction equation relating to three whole numbers.

Addition - Using Equations and Symbols to Find an Unknown:

In this tutorial, you will learn to use symbols to record an unknown whole number in an addition equation relating to three whole numbers.



Parent Resources

Problem-Solving Tasks

Name Description
Find the Missing Number:

This task asks students to solve addition and subtraction equations with different structures so that they are able to see the connections between addition and subtraction more easily. Examples should be presented with the the sum or difference on either side of the equal sign in order to dispel the notion that = means "compute."

Kiri's Mathematics Match Game:

In all versions, students must engage basic addition and subtraction facts. In the memory version, after a student has turned over one card, in order to know whether there is a match using cards they've seen, they need to to solve equations of the form ?+b=c, b+?=c, ?-b=c, and b-?=c.

Tutorials

Name Description
Subtraction - Using Equations and Symbols to Find an Unknown:

In this tutorial, you will learn to use symbols to record an unknown whole number in a subtraction equation relating to three whole numbers.

Addition - Using Equations and Symbols to Find an Unknown:

In this tutorial, you will learn to use symbols to record an unknown whole number in an addition equation relating to three whole numbers.



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