## Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

106 Lesson(s)

### 3 Addends

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (22)

Resources (15)

Reflections (1)

### Adding and Subtracting Multiples of Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (23)

Resources (22)

Reflections (1)

### Equal or Not?

1st Grade Math » Unit: Understanding Equality
1st Grade Math » Unit: Understanding Equality
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (27)

Resources (19)

Reflections (1)

### Identify Related Facts - Day 1 of 2

1st Grade Math » Unit: Single Digit Addition and Subtraction
1st Grade Math » Unit: Single Digit Addition and Subtraction
Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (28)

Resources (12)

Reflections (1)

### Use Addition to Check Subtraction

1st Grade Math » Unit: Single Digit Addition and Subtraction
1st Grade Math » Unit: Single Digit Addition and Subtraction
Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (13)

Resources (12)

Reflections (1)

### How Many Dots?

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (30)

Resources (29)

Reflections (1)

### Explain a double

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (20)

Resources (18)

Reflections (1)

### Using the Number Grid to Add or Subtract Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (14)

Resources (20)

Reflections (1)

### Counting Back

1st Grade Math » Unit: Single Digit Addition and Subtraction
1st Grade Math » Unit: Single Digit Addition and Subtraction
Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (10)

Resources (12)

Reflections (1)

### Addition and Subtraction Carnival

1st Grade Math » Unit: Working with Numbers, Operations, and Story Problems
1st Grade Math » Unit: Working with Numbers, Operations, and Story Problems
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (11)

Resources (19)

Reflections (1)

### Using 3 or More Addends to Make a Meal

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (12)

Resources (14)

Reflections (1)

### Crayon Box Combinations

1st Grade Math » Unit: Properties of Addition and Subtraction
1st Grade Math » Unit: Properties of Addition and Subtraction
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (6)

Resources (15)

Reflections (1)

### Peas and Carrots...Carrots and Peas

1st Grade Math » Unit: Properties of Addition and Subtraction
1st Grade Math » Unit: Properties of Addition and Subtraction
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (15)

Reflections (1)

### Skiing or Boarding?

1st Grade Math » Unit: Data and Analysis
1st Grade Math » Unit: Data and Analysis
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Resources (22)

Reflections (1)

### Pick Your Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (3)

Resources (14)

Reflections (1)
Common Core Math

### High School

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