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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.)

Domino Addition: Understanding the Part/Part/Whole Relationship

2nd Grade Math

» Unit:

Addition and Subtraction Basic Training

Big Idea:The big idea of this lesson is the understanding that addition can be represented as parts of a whole and that we can use addition sentences to represent those parts.

The Neighbors of Doubles

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that students can solve for near doubles by thinking of the related doubles fact.

Making a Ten

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:Making ten is one of the foundational strategies for developing flexible numerical thinking, accuracy, and efficiency.

Thinking Addition Facts to 18 to Subtract

2nd Grade Math

» Unit:

The Action of Subtraction

Big Idea:Students apply their understanding of addition to solve related subtraction problems.

Think About Subtracting Nothing

2nd Grade Math

» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is thinking about subtraction facts with 0, 1, and 2 as amounts less than a number.

10 More and 10 Less

2nd Grade Math

» Unit:

Each Number Has a Place

Big Idea:The big idea of this lesson is for students to understand that our number system allows for identifying 10 more and 10 less than a number by simply adjusting the digit in the tens place.

Double Trouble

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that students can think about doubles facts as world situations to help commit them to memory.

Subtracting Doubles

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.

Go Fishing for a Ten

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that students can use a familiar card game to help them build their math fact fluency for facts where the sum is 10.

Make a Ten, Subtraction Style

2nd Grade Math

» Unit:

The Action of Subtraction

Big Idea:The big idea of this lesson is that some subtraction facts can be solved by subtracting from the larger number an amount to get ten and then subtracting the remaining amount.

Think About Related Addition Facts to 10

2nd Grade Math

» Unit:

The Action of Subtraction

Big Idea:Students can use their knowledge of using addition to make ten to help them find the related subtraction fact.

More Than Two Numbers

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is that three (or more) numbers can be grouped together and added. The order of this grouping doesn't matter.

Sets of Things

2nd Grade Math

» Unit:

Getting Ready to Multiply

Big Idea:Multiplication sounds cool to second graders, but we have to know what it is first. Creating and counting sets is one way to get there

Go Fishing for Doubles

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:Students play a favorite card game which practices the quick and accurate recall of double facts.

Think About Adding Nothing and a Little More

2nd Grade Math

» Unit:

The Mission of Addition

Big Idea:The big idea of this lesson is the understanding that the number relationships between 0 more than, 1 more than, and 2 more than lay the foundation for the basic addition facts with 0, 1, and 2.

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.

2.NBT.B.6

Add up to four two-digit numbers using strategies based on place value and properties of operations.

2.NBT.B.7

Add 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.8

Mentally 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.9

Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)