Standard #: MAFS.1.OA.3.6 (Archived Standard)


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Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).


General Information

Subject Area: Mathematics
Grade: 1
Domain-Subdomain: Operations and Algebraic Thinking
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Add and subtract within 20. (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

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

Educational Game

Name Description
Underwater Subtraction

Dive deep with this fun subtraction facts game. Correctly answer the math facts and capture pictures of sea creatures! Choose to focus on one fact family or practice them all!

Educational Software / Tool

Name Description
Grouping and Grazing

This interactive Flash applet helps children learn grouping, tally marks, place value, addition, and subtraction. Students help the alien spaceship move cows into corrals by counting by 5s and 10s. They also can apply those grouping skills to practice adding and subtracting two-digit numbers with regrouping. Audio cues and prompts reinforce the user's actions and facilitate counting and the development of math language.

Formative Assessments

Name Description
Using Addition and Subtraction Strategies

Students solve two problems, each in more than one way, and are encouraged to use more sophisticated strategies.

Ways to Solve A Problem

Students are encouraged to use more sophisticated strategies to solve a part-part-whole problem.

Use Strategies to Add and Subtract

Students solve addition and subtraction problems by making tens, using a known fact, and by using a subtraction fact.

More Than One Way to Solve a Problem

Students solve an addition and a subtraction problem in more than one way.

Lesson Plans

Name Description
Duck Addition

Students will listen to the book, Quack and Count by Keith Baker, and use the information in the book along with manipulatives to create addition equations. Students will then relate the addition equation to a subtraction equation. Specifically, students will be working on creating the addition and related subtraction facts with the number combinations for 7.

Show What You Know: Addition and Subtraction Strategies Project

This project is to be used at the end of the school year once all the addition and subtraction strategies have been taught. This is a review of the strategies and is an excellent way for students to show what they know about their understanding of addition and subtraction strategies.

Think Addition and Make a Ten to Subtract

This lesson will teach students a strategy to subtract one-digit numbers from teen numbers by thinking addition and making-a-ten using double ten frames and two-color counters. This lesson supports previous work with restating subtraction problems as missing addend problems.

Show It Another Way

In this lesson, students will apply properties of addition in order to add three whole numbers. Students will then decompose the sum using tens and ones.

Using the "Make-a-Ten" Strategy to Add

In this lesson, students will use the "make-a-ten" strategy to add two whole numbers within 20. Students will utilize a ten frame and 2-color counters to complete this activity.

Creature Island

This lesson outlines a game that is a fun and engaging to practice the make a ten strategy, within 20.

Sums of Ten Pyramid

In this lesson, students will play a card game to practice finding pairs of numbers that make 10 when added.

Solving Word Problems Using Story Structure

In this lesson, students will learn how to use their knowledge of beginning, middle, and end to solve word problems that include result unknown, change unknown, and start unknown. They will learn how to use a modified story map to write an equation to represent the problem.

Dangerous Doubles (Doubling Numbers)

This lesson teaches students to use the strategy doubling numbers and doubles plus or minus one in order to use mental math to add one-digit numbers. The students are engaged in learning through the read-aloud of "Double the Ducks" by Stephen Murphy and then get to work with a partner to draw doubles and write equations that relate to their drawings. Students individually work on solving word problems using these strategies and manipulatives as necessary to solve.

Problem-Solving Tasks

Name Description
$20 Dot Map

The language for this task is written above a 1st grade reading level, so it will need to be introduced verbally by the teacher. This problem helps students to practice adding three numbers whose sum are 20 or less. It is an open-ended problem with many solutions.

Making a ten

This task is designed to help students visualize where the 10's are on a single digit addition table and explain why this is so. This knowledge can then be used to help them learn the addition table.

Teaching Idea

Name Description
Fact of the Day This article proposes a structured set of lively, brief, daily exercises designed to help children master number facts and mental math skills. Each day's practice focuses on a small, highly focused, manageable, and strategically selected set of facts or skills that builds directly on the previous days' learning. Related resources (Practice and videos) are cataloged separately.

Tutorial

Name Description
Change Unknown - 3 + ? = 10

In this tutorial, you will learn to find the unknown change in an equation with a sum of 10: 3 + ? = 10.

Virtual Manipulative

Name Description
Math Match - Concepts Review Game This interactive game allows students to review math concepts, including shapes, shape names, addition, multiplication, negative numbers, and equivalent expressions.

Student Resources

Educational Game

Name Description
Underwater Subtraction:

Dive deep with this fun subtraction facts game. Correctly answer the math facts and capture pictures of sea creatures! Choose to focus on one fact family or practice them all!

Educational Software / Tool

Name Description
Grouping and Grazing:

This interactive Flash applet helps children learn grouping, tally marks, place value, addition, and subtraction. Students help the alien spaceship move cows into corrals by counting by 5s and 10s. They also can apply those grouping skills to practice adding and subtracting two-digit numbers with regrouping. Audio cues and prompts reinforce the user's actions and facilitate counting and the development of math language.

Tutorial

Name Description
Change Unknown - 3 + ? = 10:

In this tutorial, you will learn to find the unknown change in an equation with a sum of 10: 3 + ? = 10.



Parent Resources

Educational Software / Tool

Name Description
Grouping and Grazing:

This interactive Flash applet helps children learn grouping, tally marks, place value, addition, and subtraction. Students help the alien spaceship move cows into corrals by counting by 5s and 10s. They also can apply those grouping skills to practice adding and subtracting two-digit numbers with regrouping. Audio cues and prompts reinforce the user's actions and facilitate counting and the development of math language.

Problem-Solving Tasks

Name Description
$20 Dot Map:

The language for this task is written above a 1st grade reading level, so it will need to be introduced verbally by the teacher. This problem helps students to practice adding three numbers whose sum are 20 or less. It is an open-ended problem with many solutions.

Making a ten:

This task is designed to help students visualize where the 10's are on a single digit addition table and explain why this is so. This knowledge can then be used to help them learn the addition table.

Tutorial

Name Description
Change Unknown - 3 + ? = 10:

In this tutorial, you will learn to find the unknown change in an equation with a sum of 10: 3 + ? = 10.



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