1.NBT.B.2

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- 1.NBT.B.2Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
- 1.NBT.B.3Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

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1.NBT.B.2a

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- 1.NBT.B.2a10 can be thought of as a bundle of ten ones — called a “ten.”
- 1.NBT.B.2bThe numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
- 1.NBT.B.2cThe 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).

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## 1.NBT.B.2a

## 10 can be thought of as a bundle of ten ones — called a “ten.”

13 Lesson(s)

### Don't Let Pigeon Drive The Bus: Concepts of 10 and Some More

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Don't let the pigeon drive the bus! Students build an understanding of numbers 11-19 as ten and some more using concrete models, all while connecting back to a well-loved story.

Standards:

Favorites
(40)

Resources
(17)

Reflections
(1)

### Tens and Ones to 50

1st Grade Math »
Unit: Numbers and Place Value

1st Grade Math »
Unit: Numbers and Place Value

Big Idea:

#### Tens, Tens! In this lesson students will use base ten blocks to build numbers to 50.

Standards:

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(6)

Resources
(13)

Reflections
(1)

### Counting From A Number

1st Grade Math »
Unit: Working with Numbers, Operations, and Story Problems

1st Grade Math »
Unit: Working with Numbers, Operations, and Story Problems

Big Idea:

#### Students will continue working with games that ask them to use the counting on strategy. The lesson will end with a story problem that allows for the students to use the counting on strategy in a real world situation.

Standards:

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(9)

Resources
(19)

Reflections
(1)

### Understanding Ten Rods

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Students are introduced to the concept of 10 in a new way in this hands on lesson. Students move from using ten frames to ten rods.

Standards:

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(14)

Resources
(14)

Reflections
(1)

### Numbers in the Teens

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Students use base ten models to create numbers in the teens, and sing while they do it!

Standards:

Favorites
(13)

Resources
(15)

Reflections
(1)

### M&M Tens

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Students bundle into tens in this engaging lesson where they pretend to work at a M&M factory!

Standards:

Favorites
(7)

Resources
(14)

Reflections
(1)

### Tens Are Everywhere!

1st Grade Math »
Unit: Numbers and Place Value

1st Grade Math »
Unit: Numbers and Place Value

Big Idea:

#### This is stage one for my class to begin developing ideas about place value. This lesson will help students see that groups of ones can be changed into sets of tens.

Standards:

Favorites
(12)

Resources
(9)

Reflections
(1)

### Three Stacks

1st Grade Math »
Unit: The Number 10 and the Addition and Subtraction Concept

1st Grade Math »
Unit: The Number 10 and the Addition and Subtraction Concept

Big Idea:

#### Students use connecting cubes in a game to create a visual representation of combination to 10. The lesson ends with the students solving story problems with relational ship thinking.

Favorites
(1)

Resources
(23)

Reflections
(1)

### Perfect 10's

1st Grade Math »
Unit: Building Counting Skills

1st Grade Math »
Unit: Building Counting Skills

Big Idea:

#### Perfect 10! I want my students to identify the relationship between ones and sets of ten. They need to identify that 10 is a set of 10 ones.

Standards:

Favorites
(5)

Resources
(13)

Reflections
(1)

### Happy Birthday Little Bear

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Students help Little Bear get ready for his party in this lesson where they decompose large numbers into groups of ten. These problems help students apply the key aspects of 1.NBT.B.2a to real life problems!

Standards:

Favorites
(6)

Resources
(15)

Reflections
(1)

Big Idea:

#### It’s about tens! In this lesson students will use pictures, models and numbers to represent tens.

Standards:

Favorites
(4)

Resources
(13)

Reflections
(1)

### End of Unit Assessment

1st Grade Math »
Unit: Complements of 10 and 20

1st Grade Math »
Unit: Complements of 10 and 20

Big Idea:

#### Today's lesson will allow you to see how your students have developed with their understanding of groupings, complements of 10 and 20 and how fluently they can add and/or subtract within 10.

Standards:

Resources
(16)

Reflections
(1)

### Sticker Stories

1st Grade Math »
Unit: 10: A First Grader's Best Friend

1st Grade Math »
Unit: 10: A First Grader's Best Friend

Big Idea:

#### Students sweat in this rigorous lesson about grouping into tens! Students apply what they know about tens to early division problems, focusing on MP1, "Make sense of problems and persevere in solving them".

Standards:

Favorites
(7)

Resources
(16)

Reflections
(1)

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