2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

 
24 Lesson(s)
   

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.

 
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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.

 
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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.

 
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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.

 
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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.

 
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Reflections (1)
bugre americanu
   

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.

 
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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.

 
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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.

 
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Reflections (1)
screen shot 2013 12 19 at 4 00 51 pm
   

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.

 
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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

 
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images
   

The Recipe for a Great Word Problem

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 to have students write their own word problems to help them have a better understanding of mathematical operations, as they relate to real world scenarios.

 
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recipe for a great word
   

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.

 
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256px linking cm cubes 2
   

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.

 
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Reflections (2)
100 0591
   

10 and Some More

1st Grade Math » Unit: Complements of 10 and 20
1st Grade Math » Unit: Complements of 10 and 20
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Your students will play a game where they combine two single digit numbers and then record that total in terms of how it relates to ten.

 
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Reflections (1)
lesson image
   

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.

 
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Resources (13)
 
Reflections (1)
100 0464
Common Core Math
 
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