2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

 
58 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.

 
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Resources (17)
 
Reflections (1)
multilink cubes
   

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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Resources (14)
 
Reflections (1)
neighbors of
   

Put It All Together

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:

As mathematical thinkers we must use the information from a real world problem and determine what is the correct method to solve the problem.

Standards:
 
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Resources (15)
 
Reflections (1)
screen shot 2013 12 05 at 9 28 37 am
   

Step One, Step Two

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 sometimes it may be necessary to answer one problem to help answer another problem.

Standards:
 
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Resources (15)
 
Reflections (1)
screen shot 2013 12 19 at 4 11 45 pm
   

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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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.

 
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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
   

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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Resources (16)
 
Reflections (1)
screen shot 2013 12 19 at 2 45 55 pm
   

Riddle Me This... Using Data

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 that students will need to use deductive reasoning skills and data to help them solve problems.

 
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Resources (12)
 
Reflections (1)
screen shot 2013 12 21 at 1 28 32 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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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.

 
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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
   

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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Resources (14)
 
Reflections (1)
recipe for a great word
   

Addition in the Real World

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 that we can think of addition in the real world as the joining of two parts to make a whole. The use of addition number sentences can show how we join the parts to make the whole.

Standards:
 
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Resources (17)
 
Reflections (1)
part part whole resized
   

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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