2.NBT.A.1

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- 2.NBT.A.1Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
- 2.NBT.A.2Count within 1000; skip-count by 5s, 10s, and 100s.
- 2.NBT.A.3Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
- 2.NBT.A.4Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

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## 2.NBT.A.1a

## 100 can be thought of as a bundle of ten tens — called a “hundred.”

5 Lesson(s)

### Each Number Has a Place: Tens and Ones

2nd Grade Math »
Unit: Each Number Has a Place

2nd Grade Math »
Unit: Each Number Has a Place

Big Idea:

#### The big idea of this lesson is that the base-ten number system uses models to show numbers. The ones digit represents how many ones, and the tens digit represents how many groups of ten.

Standards:

Favorites
(57)

Resources
(15)

Reflections
(1)

### Moving Along In Tens

2nd Grade Math »
Unit: Everything In Its Place

2nd Grade Math »
Unit: Everything In Its Place

Big Idea:

#### Grouping by tens reinforces the understanding of place value

Standards:

Favorites
(5)

Resources
(11)

Reflections
(1)

### Manipulation Central

2nd Grade Math »
Unit: More Complex Numbers and Operations

2nd Grade Math »
Unit: More Complex Numbers and Operations

### Magic of Adding Tens

2nd Grade Math »
Unit: Sensible Numbers

2nd Grade Math »
Unit: Sensible Numbers

Big Idea:

#### Students should have mastered adding numbers within 10 in first grade. The Common Core stresses adding bundles of tens in second grade.

Standards:

Favorites
(3)

Resources
(12)

Reflections
(2)

Common Core Math

### Kindergarten

### First Grade

### Second Grade

### Third Grade

### Fourth Grade

### Fifth Grade

### Sixth Grade

### Seventh Grade

### HS Number & Quantity

### HS Algebra

### HS Functions

### HS Geometry

### Kindergarten

### First Grade

### Second Grade

### Third Grade

### Fourth Grade

### Fifth Grade

### Sixth Grade

### Seventh Grade

### Eighth Grade

### Ninth and Tenth Grade

### Kindergarten

### First grade

### Second grade

### Third Grade

### Fourth grade

### Fifth grade

### Middle School

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

HS Number & Quantity

HS Algebra

HS Functions

HS Geometry

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

Eighth Grade

Ninth and Tenth Grade

Kindergarten

First grade

Second grade

Third Grade

Fourth grade

Fifth grade

Middle School