## Explain why addition and subtraction strategies work, using place value and the properties of operations. (Explanations may be supported by drawings or objects.)

45 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
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (20)

Resources (20)

Reflections (1)

### The Neighbors of Doubles

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (32)

Resources (14)

Reflections (1)

### Making a Ten

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (17)

Resources (15)

Reflections (1)

### Thinking Addition Facts to 18 to Subtract

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (13)

Resources (13)

Reflections (1)

### Think About Subtracting Nothing

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (13)

Resources (11)

Reflections (1)

### Double Trouble

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (8)

Resources (14)

Reflections (1)

### Subtracting Doubles

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (8)

Resources (16)

Reflections (1)

### Think About Related Addition Facts to 10

2nd Grade Math » Unit: The Action of Subtraction
2nd Grade Math » Unit: The Action of Subtraction
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (7)

Resources (14)

Reflections (1)

### More Than Two Numbers

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (10)

Resources (12)

Reflections (1)

### Go Fishing for Doubles

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (11)

Resources (11)

Reflections (1)

### Think About Adding Nothing and a Little More

2nd Grade Math » Unit: The Mission of Addition
2nd Grade Math » Unit: The Mission of Addition
Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (6)

Resources (16)

Reflections (1)

### Doubles Plus or Minus One

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

Big Idea:

Standards:

Favorites (4)

Resources (13)

Reflections (1)

### Counting Bugs

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

Big Idea:

Standards:

Favorites (9)

Resources (10)

Reflections (1)

### 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
Environment: Urban

Big Idea:

Standards:

Favorites (8)

Resources (20)

Reflections (1)

### Let Me Count The Ways to Get An Answer

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

Big Idea:

Standards:

Favorites (12)

Resources (9)

Reflections (1)
Common Core Math

### High School

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