## 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

Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (22)

Resources (20)

Reflections (1)

### The Neighbors of Doubles

Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (32)

Resources (14)

Reflections (1)

### Making a Ten

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:

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

Standards:

Favorites (13)

Resources (13)

Reflections (1)

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

Big Idea:

Standards:

Favorites (14)

Resources (11)

Reflections (1)

### Double Trouble

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:

#### 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.

Standards:

Favorites (8)

Resources (16)

Reflections (1)

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

Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (10)

Resources (12)

Reflections (1)

### Go Fishing for Doubles

Pepperell, MA
Environment: Rural

Big Idea:

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

Standards:

Favorites (12)

Resources (11)

Reflections (1)

Pepperell, MA
Environment: Rural

Big Idea:

Standards:

Favorites (7)

Resources (16)

Reflections (1)

### Doubles Plus or Minus One

York, ME
Environment: Suburban

Big Idea:

Standards:

Favorites (4)

Resources (13)

Reflections (1)

### Counting Bugs

York, ME
Environment: Suburban

Big Idea:

Standards:

Favorites (9)

Resources (10)

Reflections (1)

### How do I solve a change unknown word problem?

Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (20)

Reflections (1)

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

York, ME
Environment: Suburban

Big Idea:

Standards:

Favorites (14)

Resources (9)

Reflections (1)
Common Core Math