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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

Â» 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.

Partners Make Ten

2nd Grade Math

Â» Unit:

Sensible Numbers

Big Idea:This lesson builds a foundation for adding larger numbers which is supported by the Common Core standards for second grade..

Finding the Right Place!

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Students use numbers, base-ten models, and real-word pictures to examine ways to place numbers in their correct place.

Identifying Tens and Ones

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Students will be given set amount of money to add, and identify how many tens and ones.

Mentally Speaking!

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Using base ten blocks and place value, students explore how to become more fluent in adding and subtracting two-digit numbers without regrouping.

Introduction to Four Addends

2nd Grade Math

Â» Unit:

Adding Four Addends

Big Idea:In this lesson, students identify strategies to add four two-digit numbers together.

Applying The Basics!

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Using base-ten materials and place-value skills, students gain a better understanding of how to add and subtract numbers.

Abracadabra

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:Students will be able to explain using concrete objects, pictures and words (oral or written) why addition or subtraction strategies work.

Tallying it Up

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:In this collaborative lesson students will use "Head, or Tails" to learn how to tally count by fives and add on left over numbers.

Keep On Doing!

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:In this lesson, students will explore how the use of base tens, and place value can be used to help them explain and solve addition word problems.

Manipulation Central

2nd Grade Math

Â» Unit:

More Complex Numbers and Operations

Big Idea:Not everyone solves a problem in the same way. Reinforcing that different strategies can be used effectively is the goal of this lesson.

What's in Your Zoo?

2nd Grade Math

Â» Unit:

Numbers & Operation in Base Ten Grade 2

Big Idea:In this lesson, students will create pictures using base ten blocks as models for numbers between 200 and 1000.

10, 20, 100 Day 2

1st Grade Math

Â» Unit:

Complements of 10 and 20

Big Idea:Students will use dice to roll a number and then find the complement to make 10, 20 or 100.

My Special Strategies

2nd Grade Math

Â» Unit:

Strategies That Work

Big Idea:Do you know which strategies work for you? Lets make sure you know which ones those are.

Assessment

2nd Grade Math

Â» Unit:

More Complex Numbers and Operations

Big Idea:Assessment provides us with a chance to see what children understand and what they still need to work on.

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.)