## Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

19 Lesson(s)

### 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)

### 10 More and 10 Less

1st Grade Math » Unit: Numbers and Place Value
1st Grade Math » Unit: Numbers and Place Value
Lakeland, FL
Environment: Urban

Big Idea:

Standards:

Favorites (21)

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)

### 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 (14)

Resources (20)

Reflections (1)

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)

### Base 10 Toy Box

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

Big Idea:

Standards:

Favorites (11)

Resources (27)

Reflections (1)

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

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 (6)

Resources (19)

Reflections (1)

### 10 More, 10 Less

1st Grade Math » Unit: Place Value
1st Grade Math » Unit: Place Value
Oklahoma City, OK
Environment: Urban

Big Idea:

Standards:

Favorites (6)

Resources (19)

Reflections (1)

### End Of Unit Assessment

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 (4)

Resources (20)

Reflections (1)

### 10 more or less on a 120 chart

1st Grade Math » Unit: Place Value
1st Grade Math » Unit: Place Value
Oklahoma City, OK
Environment: Urban

Big Idea:

#### Before First Graders are able to solve mentally, they must develop a concrete understanding of 10 less or 10 more than a given two-digit number. This lesson provides my students an opportunity to transition to solving mentally.

Standards:

Favorites (3)

Resources (14)

Reflections (1)

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

Big Idea:

Standards:

Favorites (7)

Resources (13)

Reflections (1)

### Mid Unit Check In

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 (23)

Reflections (1)

### How Many Dots? Day 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 (7)

Resources (20)

Reflections (2)

### Beachy Base 10

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

Big Idea:

Standards:

Favorites (2)

Resources (22)

Reflections (1)

### 10 Less: An Exploration

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

Big Idea:

Standards:

Favorites (8)

Resources (16)
Common Core Math