## 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)

Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (19)

Resources (15)

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 (25)

Resources (19)

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 (20)

Resources (22)

Reflections (1)

### Use Addition to Check Subtraction

Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (12)

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 (29)

Resources (29)

Reflections (1)

### Identify Related Facts - Day 1 of 2

Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (27)

Resources (12)

Reflections (1)

### Explain a double

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:

#### The Number Grid Challenge. Students will play a game that requires them to add or subtract ten from a number using the number grid. They will record their results using standard notation.

Standards:

Favorites (13)

Resources (20)

Reflections (1)

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

Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (12)

Resources (14)

Reflections (1)

### Counting Back

Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (12)

Reflections (1)

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

New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (15)

Reflections (1)

### Crayon Box Combinations

New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (6)

Resources (15)

Reflections (1)

### Doubles & Doubles +1 Practice

Gilbert, IA
Environment: Rural

Big Idea:

#### Doubles and doubles +1 are two strategies that 1st graders use to help them solve their basic facts and even two-digit addition

Standards:

Favorites (15)

Resources (13)

Reflections (2)

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 (2)

Resources (14)

Reflections (1)
Common Core Math