2.NBT.B.5

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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.5

## Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

56 Lesson(s)

### Domino Addition: Understanding the Part/Part/Whole Relationship

2nd Grade Math »
Unit: Addition and Subtraction Basic Training

2nd Grade Math »
Unit: Addition and Subtraction Basic Training

### The Neighbors of Doubles

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Making a Ten

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Thinking Addition Facts to 18 to Subtract

2nd Grade Math »
Unit: The Action of Subtraction

2nd Grade Math »
Unit: The Action of Subtraction

### Think About Subtracting Nothing

2nd Grade Math »
Unit: The Action of Subtraction

2nd Grade Math »
Unit: The Action of Subtraction

### 10 More and 10 Less

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

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

### Double Trouble

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Subtracting Doubles

2nd Grade Math »
Unit: The Action of Subtraction

2nd Grade Math »
Unit: The Action of Subtraction

Big Idea:

#### The big idea of this lesson is that addition and subtraction facts are related, and every subtraction fact has a related addition fact. Students can think of this inverse relationship when recalling basic subtraction facts.

Favorites
(8)

Resources
(16)

Reflections
(1)

### Go Fishing for a Ten

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Make a Ten, Subtraction Style

2nd Grade Math »
Unit: The Action of Subtraction

2nd Grade Math »
Unit: The Action of Subtraction

### Think About Related Addition Facts to 10

2nd Grade Math »
Unit: The Action of Subtraction

2nd Grade Math »
Unit: The Action of Subtraction

### More Than Two Numbers

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Sets of Things

2nd Grade Math »
Unit: Getting Ready to Multiply

2nd Grade Math »
Unit: Getting Ready to Multiply

### Go Fishing for Doubles

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

### Think About Adding Nothing and a Little More

2nd Grade Math »
Unit: The Mission of Addition

2nd Grade Math »
Unit: The Mission of Addition

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