2.NBT.B.8

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- 2.NBT.B.5Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
- 2.NBT.B.6Add up to four two-digit numbers using strategies based on place value and properties of operations.
- 2.NBT.B.7Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
- 2.NBT.B.8Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.
- 2.NBT.B.9Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)

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## 2.NBT.B.8

## Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.

7 Lesson(s)

### Hundreds, Tens, Ones Are Coins Too

2nd Grade Math »
Unit: Everything In Its Place

2nd Grade Math »
Unit: Everything In Its Place

Big Idea:

#### Students will extend their understanding of hundreds, tens and ones using dollars, dimes and pennies as another way to express groups of 100, 10 and 1.

Standards:

Favorites
(28)

Resources
(11)

Reflections
(1)

### What is One Hundred More? What is One Hundred Less?

2nd Grade Math »
Unit: Three-Digit Addition and Subtraction

2nd Grade Math »
Unit: Three-Digit Addition and Subtraction

### Mentally Speaking!

2nd Grade Math »
Unit: Numbers & Operation in Base Ten Grade 2

2nd Grade Math »
Unit: Numbers & Operation in Base Ten Grade 2

### Counting with Tens and Hundreds

2nd Grade Math »
Unit: Adding and Subtracting the Basics

2nd Grade Math »
Unit: Adding and Subtracting the Basics

### Where is the Question

2nd Grade Math »
Unit: Getting Better at Addition and Subtraction

2nd Grade Math »
Unit: Getting Better at Addition and Subtraction

Big Idea:

#### Students can perform addition and subtraction within 100 using a variety of math tools, however, determining which operation to use is a higher level thinking skill that is being introduced in this lesson.

Favorites
(2)

Resources
(15)

Reflections
(2)

### Smiley Face Number Friends

2nd Grade Math »
Unit: Everything in Its Place

2nd Grade Math »
Unit: Everything in Its Place

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