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.

 
31 Lesson(s)
   

I've Got More Than You

2nd Grade Math » Unit: Addition and Subtraction Basic Training
2nd Grade Math » Unit: Addition and Subtraction Basic Training
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

Students often think that subtraction is simply “take away.” The goal of this lesson is to allow students to see the comparison (difference) between two numbers.

 
Favorites (36)
 
Resources (17)
 
Reflections (1)
multilink cubes
   

Partners Make Ten

2nd Grade Math » Unit: Sensible Numbers
2nd Grade Math » Unit: Sensible Numbers
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

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

 
Favorites (7)
 
Resources (11)
 
Reflections (1)
images
   

Plus Ten Minus Ten

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

To help students develop fluency skills with adding and subtracting numbers within 100. A variety of strategies need to be presented to encourage students to think mathematically.

 
Favorites (9)
 
Resources (13)
 
Reflections (2)
100 0591
   

How do I solve a change unknown word problem?

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

This lessons starts with a concrete representation of a change unknown problem and then pushes students to think abstractly and develop number sentences to solve change unknown word problems.

 
Favorites (7)
 
Resources (20)
 
Reflections (1)
img 0515
   

Counting Up to Solve Problems

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

The Common Core standards expect addition and subtraction fluency with one and two digit numbers. Students need to develop efficient fluency strategies.

 
Favorites (13)
 
Resources (13)
 
Reflections (1)
100 0464
   

Subtracting Across Zeros

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students use place value blocks to accurately subtract across zeros.

 
Favorites (8)
 
Resources (16)
 
Reflections (1)
screen shot 2014 07 03 at 1 18 22 pm
   

Two-Step Word Problems (Result Unknown)

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students develop their own strategies for solving two-step word problems.

 
Favorites (10)
 
Resources (15)
 
Reflections (1)
img 0283
   

Adding Three-Digit Numbers with Regrouping

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students identify, use, and share strategies for adding three-digit numbers that require regrouping.

 
Favorites (12)
 
Resources (13)
 
Reflections (1)
url
   

Understanding Subtraction

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Understanding subtraction is as key to Common Core Standards as is understanding addition and it is usually much harder for students to grasp.

 
Favorites (4)
 
Resources (16)
 
Reflections (2)
100 0607
   

Change Unknown Word Problems

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students identify, develop, use, and share their own strategies for solving change unknown word problems.

 
Favorites (10)
 
Resources (15)
 
Reflections (1)
img 0308
   

Counting with Tens and Hundreds

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Being able to add and subtract with 10 and 100 is a Common Core skill expected of second grade students.

 
Favorites (3)
 
Resources (10)
 
Reflections (1)
appareilcarr
   

From Tens to Nines

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Fluency in adding and subtracting is expected during second grade. New strategies to add and subtract efficiently provide students with a variety of options to increase fluency.

 
Favorites (6)
 
Resources (11)
 
Reflections (1)
100 0595
   

Adding Three-Digit Numbers Without Regrouping

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students discover and share strategies for adding three-digit numbers without regrouping.

Standards:
 
Favorites (2)
 
Resources (15)
 
Reflections (1)
screen shot 2014 03 02 at 11 42 16 am
   

Getting Bigger and Smaller

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Students are extending their understanding of the base ten system by using its properties to add, subtract and compare two and three digit numbers.

 
Favorites (3)
 
Resources (9)
 
Reflections (1)
100 0489
   

How Big Is A Mile?

2nd Grade Math » Unit: Area, Perimeter and More Measurement
2nd Grade Math » Unit: Area, Perimeter and More Measurement
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

How far do I have to walk in order to make 1 mile? What if I want to walk 2 miles? We can measure, add and figure it out.

 
Resources (9)
 
Reflections (1)
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Common Core Math
 
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