MAFS.1.NBT.2.2Archived Standard

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Understand that the two digits of a two-digit number represent amounts of tens and ones.
  1. 10 can be thought of as a bundle of ten ones — called a “ten.”
  2. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
  3. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
  4. Decompose two-digit numbers in multiple ways (e.g., 64 can be decomposed into 6 tens and 4 ones or into 5 tens and 14 ones).
General Information
Subject Area: Mathematics
Grade: 1
Domain-Subdomain: Number and Operations in Base Ten
Cluster: Level 2: Basic Application of Skills & Concepts
Cluster: Understand place value. (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))
5020080: STEM Lab Grade 1 (Specifically in versions: 2016 - 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.

Educational Software / Tool

Hundreds Chart:

A printable hundreds chart featuring a 10x10 table numbered 1 to 100. (found on Illuminations website under "Trading for Quarters")

Type: Educational Software / Tool

Formative Assessments

Decompose Two-Digit Numbers:

Students are asked to decompose two-digit numbers in three different ways.

Type: Formative Assessment

How Many Tens and Ones Are There?:

Students are asked to determine how many tens and ones there are in three different two-digit numbers.

Type: Formative Assessment

Tens and Ones:

Students are asked to identify numbers that have been modeled by base ten blocks and model numbers using base ten blocks.

Type: Formative Assessment

Put Objects Into Bundles of Ten:

Students circle objects in bundles of 10, determine how many groups of 10 objects there are, and report the total number of objects.

Type: Formative Assessment

Making Tens:

Students are asked to use base ten blocks to model numbers and are then asked to identify a number that has been modeled for them.

Type: Formative Assessment

How Many Tens and Ones?:

Students examine two different two-digit numbers and describe the number of tens and ones in each number.

Type: Formative Assessment

Lesson Plans

X-Ray Superpower:

With the teacher's modeling, students will be able to understand that teen numbers are made up of a unit of ten and some more ones.

Type: Lesson Plan

Counting Coral Reef Babies:

Students will listen to the book Over in the Ocean in a Coral Reef, by Marianne Berkes. They will participate in an inquiry to figure out how many baby animals are in the book. They will show the number of animals in the book in groups of ten and some left over. This lesson is a beginning place value and addition lesson for first grade. 

Type: Lesson Plan

Best Babysitter:

Teams of students will use math to solve an open-ended, real-world problem to help their parent or caregiver choose the best babysitter. Students will apply mathematical skills of place value (two-digit number tens and ones) and counting to perform math calculations while analyzing data sets. This MEA will facilitate students demonstrating higher level critical thinking and problem solving during class discussions and in writing.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom.

Type: Lesson Plan

Twisty Cup 2-Digit Place Value:

In this lesson, students will make their own twisty cups, manipulate them to display 2-digit numbers, represent the numbers made using base ten blocks and unit blocks and record the displayed base ten numerals.

Type: Lesson Plan

Finding Ten More and Ten Less with Justen:

In this lesson, students will use manipulatives to decompose two-digit numbers into tens and ones. The students will then find ten more or ten less by adding or subtracting “just ten”. This will also be demonstrated on a hundreds chart.

Type: Lesson Plan

How Many Days? Calendar Place Value:

This is not a stand-alone lesson that delves in depth with the standard, but rather a daily activity to be used for the entire school year. It describes work that can be done with the calendar each day.

Type: Lesson Plan

Musical Place Value:

Remember playing musical chairs? Well, now do it while practicing place value. Students will practice making 2-digit numbers using base-ten blocks through this fun and engaging interactive activity.

Type: Lesson Plan

Ten is a Friend!:

Students will learn about the concept of ones and tens and how 10 is a friendly number that we can utilize in various ways in mathematics. They will physically manipulate snap cubes to make a ten train and add on randomly selected ones that will include the numbers 11-19. After that students will draw representations of the numbers 11-19 and finally write the two-digit number that a ten train and a selected group of ones will create.

Type: Lesson Plan

Ten-Hut!:

This lesson allows students to gain insight into how to use place value when adding a two-digit number and a one-digit number. The focus is on students using their bodies, as well as math manipulatives, to solve addition problems within 100 that do not require regrouping.

Type: Lesson Plan

Fishing for Tens and Ones:

In this paired activity, students will explore two digit numbers and how they are composed of tens and ones using place value disks. Students will also use terms and symbols to compare two digit numbers using the place value of the tens and ones digits.

Type: Lesson Plan

Two-Digit Place Value with Ten Frames:

The students will use ten frames to show place value of two digit numbers 0-100. Students will use different manipulatives to show place value of two digit numbers. The students will be able to recognize the correct place value for a two digit numbers.

Type: Lesson Plan

Who has more?:

The students will be able to create and compare two digit numbers using the symbols <,>, =.

Type: Lesson Plan

Fill the Bus (Exploring 2-digit Numbers):

Students will practice and explore base ten concepts and 2-digit numbers by filling ten frame buses with counters and then describing the total values in terms of tens and ones. After initial guided practice, students will play a game to fill ten buses, demonstrating the composition of each 2-digit value using objects and expressions.

Type: Lesson Plan

How Many in Your Cup?:

Students will explore the meaning of the digits in two-digit numbers as they determine the total number of objects in cups by making groups of ten. They will use the groups of ten and singles left over to figure out the total amount and then record the total in expanded form and standard form. Students will read numbers written in standard form to connect each numeral to its word name. Teacher questioning and students' discussions will help students develop an understanding of place value (tens and ones).

Type: Lesson Plan

Unpacking Tens!:

In this lesson students will use Digiblocks (place value blocks) to decompose values into tens and ones along place value lines. Students will break numbers into multiple place value decompositions. Students will also be asked to decide if 3 tens and 31 ones is one way to show the number 63. Students will be asked to solve and justify their thinking.

Type: Lesson Plan

Original Student Tutorials

Block Building Blast - Part 3:

Help Amari, Sonia, and their friends compose and decompose 2-digit numbers in equivalent ways to compete in a base ten block building contest with this interactive tutorial.

This is part 3 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Block Building Blast - Part 2:

Explore ways to break apart 2-digit numbers into tens and ones to help Amari and Sonia build base ten block towers in this interactive tutorial.

This is part 2 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Block Building Blast - Part 1:

Help Amari and Sonia build base-ten block towers using their knowledge of 2-digit place value in this interactive tutorial.

This is part 1 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Exploring Expanded Form in Space:

Astronaut Archimedes launches into space to teach the outside world all about place value and expanded form in this interactive tutorial.

Type: Original Student Tutorial

Perspectives Video: Teaching Idea

Counting Tens: Zero the Hero:

Put on your best cape and zip around with Zero the Hero to learn about the decade numbers!

Download the CPALMS Perspectives video student note taking guide.

Type: Perspectives Video: Teaching Idea

Presentation/Slideshow

Regroup Ones as Tens:

This quick slide show demonstrates for students how to use base ten blocks to regroup, trade, or change groups of 1's into 10's. When you have more than 10 ones base ten blocks, students should regroup or change, 10 ones to 1 ten. User clicks through the slides.

Type: Presentation/Slideshow

Teaching Idea

Playing with Tens and Ones:

Students will participate in a variety of activities to learn more about 2-digit numbers, including dropping counters in a bucket as they go in and out of class to accumulate groups of objects to group and count, connecting their findings to a hundred chart, and exploring our base ten system through various learning tasks.

Type: Teaching Idea

Tutorials

Place Value Example with 25:

In this tutorial, you will learn to see 25 as 2 tens and 5 ones.

Type: Tutorial

Monkeys for a party:

In this tutorial video from Khan Academy, explore place value relationships with tens and ones within 20.

Type: Tutorial

Teens as sums with 10:

In this tutorial video from Khan Academy, place value patterns are explored in "teen" numbers.

Type: Tutorial

Video/Audio/Animation

Candy Shipping:

Choose the correct amount of candy to package in the box. The truck will deliver the correctly filled packages.

Type: Video/Audio/Animation

STEM Lessons - Model Eliciting Activity

Best Babysitter:

Teams of students will use math to solve an open-ended, real-world problem to help their parent or caregiver choose the best babysitter. Students will apply mathematical skills of place value (two-digit number tens and ones) and counting to perform math calculations while analyzing data sets. This MEA will facilitate students demonstrating higher level critical thinking and problem solving during class discussions and in writing.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom.

MFAS Formative Assessments

Decompose Two-Digit Numbers:

Students are asked to decompose two-digit numbers in three different ways.

How Many Tens and Ones Are There?:

Students are asked to determine how many tens and ones there are in three different two-digit numbers.

How Many Tens and Ones?:

Students examine two different two-digit numbers and describe the number of tens and ones in each number.

Making Tens:

Students are asked to use base ten blocks to model numbers and are then asked to identify a number that has been modeled for them.

Put Objects Into Bundles of Ten:

Students circle objects in bundles of 10, determine how many groups of 10 objects there are, and report the total number of objects.

Tens and Ones:

Students are asked to identify numbers that have been modeled by base ten blocks and model numbers using base ten blocks.

Original Student Tutorials Mathematics - Grades K-5

Block Building Blast - Part 1:

Help Amari and Sonia build base-ten block towers using their knowledge of 2-digit place value in this interactive tutorial.

This is part 1 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Block Building Blast - Part 2:

Explore ways to break apart 2-digit numbers into tens and ones to help Amari and Sonia build base ten block towers in this interactive tutorial.

This is part 2 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Block Building Blast - Part 3:

Help Amari, Sonia, and their friends compose and decompose 2-digit numbers in equivalent ways to compete in a base ten block building contest with this interactive tutorial.

This is part 3 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Exploring Expanded Form in Space:

Astronaut Archimedes launches into space to teach the outside world all about place value and expanded form in this interactive tutorial.

Student Resources

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

Original Student Tutorials

Block Building Blast - Part 3:

Help Amari, Sonia, and their friends compose and decompose 2-digit numbers in equivalent ways to compete in a base ten block building contest with this interactive tutorial.

This is part 3 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Block Building Blast - Part 2:

Explore ways to break apart 2-digit numbers into tens and ones to help Amari and Sonia build base ten block towers in this interactive tutorial.

This is part 2 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Block Building Blast - Part 1:

Help Amari and Sonia build base-ten block towers using their knowledge of 2-digit place value in this interactive tutorial.

This is part 1 of 3. Click below to view the other tutorials in this series.

Part 1

Part 2

Part 3

Type: Original Student Tutorial

Exploring Expanded Form in Space:

Astronaut Archimedes launches into space to teach the outside world all about place value and expanded form in this interactive tutorial.

Type: Original Student Tutorial

Educational Software / Tool

Hundreds Chart:

A printable hundreds chart featuring a 10x10 table numbered 1 to 100. (found on Illuminations website under "Trading for Quarters")

Type: Educational Software / Tool

Tutorials

Place Value Example with 25:

In this tutorial, you will learn to see 25 as 2 tens and 5 ones.

Type: Tutorial

Monkeys for a party:

In this tutorial video from Khan Academy, explore place value relationships with tens and ones within 20.

Type: Tutorial

Teens as sums with 10:

In this tutorial video from Khan Academy, place value patterns are explored in "teen" numbers.

Type: Tutorial

Video/Audio/Animation

Candy Shipping:

Choose the correct amount of candy to package in the box. The truck will deliver the correctly filled packages.

Type: Video/Audio/Animation

Parent Resources

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

Educational Software / Tool

Hundreds Chart:

A printable hundreds chart featuring a 10x10 table numbered 1 to 100. (found on Illuminations website under "Trading for Quarters")

Type: Educational Software / Tool

Tutorials

Monkeys for a party:

In this tutorial video from Khan Academy, explore place value relationships with tens and ones within 20.

Type: Tutorial

Teens as sums with 10:

In this tutorial video from Khan Academy, place value patterns are explored in "teen" numbers.

Type: Tutorial