## Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

22 Lesson(s)

### It's As Basic As That

3rd Grade Math » Unit: Understanding Multiplication
3rd Grade Math » Unit: Understanding Multiplication
Troy, MI
Environment: Suburban

Big Idea:

Standards:

Favorites (15)

Resources (11)

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)

### 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)

### Down on the Farm: Base 10 Problems

1st Grade Math » Unit: Count to 100 Every Day!
1st Grade Math » Unit: Count to 100 Every Day!
New Orleans, LA
Environment: Urban

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Standards:

Favorites (29)

Resources (19)

Reflections (1)

### Sugar, Sugar!

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (18)

Resources (18)

Reflections (1)

### Using a Hundreds Chart to Add

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

Big Idea:

Standards:

Favorites (11)

Resources (11)

Reflections (1)

### Use Models to Add

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

Big Idea:

Standards:

Favorites (19)

Resources (12)

Reflections (1)

### Adding Big Numbers with Butterflies

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (10)

Resources (12)

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)

### Combine and Compare

1st Grade Math » Unit: Blending
1st Grade Math » Unit: Blending
Waitsfield, VT
Environment: Suburban

Big Idea:

#### Blending is not just for ELA teachers! Today students will learn to "blend" (combine) two sets of dots and then compare the number to another using greater than by playing versions of previous learned activities.

Standards:

Favorites (3)

Resources (17)

Reflections (1)

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

Big Idea:

Standards:

Favorites (14)

Resources (12)

Reflections (1)

### How Many On My Plate? (Addition)

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 (5)

Resources (24)

Reflections (1)

### Introduction to Money

1st Grade Math » Unit: Money!
1st Grade Math » Unit: Money!
Waitsfield, VT
Environment: Suburban

Big Idea:

Standards:

Favorites (12)

Resources (21)

Reflections (1)

### Books and Base 10

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (7)

Resources (17)

Reflections (1)

### The Wheels on the Bus

1st Grade Math » Unit: Base 10 Bonanza
1st Grade Math » Unit: Base 10 Bonanza
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (5)

Resources (16)

Reflections (1)
Common Core Math