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
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
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Resources (20)
 
Reflections (1)
part part whole
   

The Neighbors of Doubles

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (32)
 
Resources (14)
 
Reflections (1)
neighbors of
   

Making a Ten

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (15)
 
Resources (15)
 
Reflections (1)
screen shot 2013 12 19 at 9 58 29 am
   

Thinking Addition Facts to 18 to Subtract

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (12)
 
Resources (13)
 
Reflections (1)
screen shot 2013 12 19 at 3 31 43 pm
   

Think About Subtracting Nothing

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (13)
 
Resources (11)
 
Reflections (1)
screen shot 2013 12 19 at 12 47 01 pm
   

Double Trouble

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
Favorites (8)
 
Resources (14)
 
Reflections (1)
bugre americanu
   

10 More and 10 Less

2nd Grade Math » Unit: Each Number Has a Place
2nd Grade Math » Unit: Each Number Has a Place
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
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Resources (16)
 
Reflections (1)
screen shot 2013 12 21 at 1 05 33 pm
   

Go Fishing for a Ten

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
Favorites (11)
 
Resources (12)
 
Reflections (1)
screen shot 2013 12 19 at 12 14 25 pm
   

Subtracting Doubles

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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)
screen shot 2013 12 19 at 2 45 55 pm
   

Make a Ten, Subtraction Style

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
Favorites (6)
 
Resources (16)
 
Reflections (1)
screen shot 2013 12 19 at 4 00 51 pm
   

More Than Two Numbers

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
Favorites (10)
 
Resources (12)
 
Reflections (1)
prev800p1
   

Think About Related Addition Facts to 10

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (7)
 
Resources (14)
 
Reflections (1)
screen shot 2013 12 19 at 2 11 00 pm
   

Sets of Things

2nd Grade Math » Unit: Getting Ready to Multiply
2nd Grade Math » Unit: Getting Ready to Multiply
Beth McKenna
York, ME
Environment: Suburban
 
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

 
Favorites (1)
 
Resources (12)
 
Reflections (1)
images
   

Go Fishing for Doubles

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
Big Idea:

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

 
Favorites (11)
 
Resources (11)
 
Reflections (1)
happy boy with glasses on fishing proudly holding a fish catch
   

Think About Adding Nothing and a Little More

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Kristen O'Connor
Pepperell, MA
Environment: Rural
 
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.

 
Favorites (6)
 
Resources (16)
 
Reflections (1)
256px linking cm cubes 2
Common Core Math
 
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