## Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

8 Lesson(s)

### Math Fact Sorting

New Orleans, LA
Environment: Urban

Big Idea:

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Favorites (5)

Resources (17)

Reflections (1)

### How Many In My Hand?

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

Big Idea:

#### Today everyone becomes a magician as students are able to use a known starting number and one chunk (addend) of that known number, to determine the amount that is being hidden.

Standards:

Favorites (7)

Resources (20)

Reflections (1)

1st Grade Math » Unit: Subtraction Strategies
1st Grade Math » Unit: Subtraction Strategies
Oklahoma City, OK
Environment: Urban

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Standards:

Favorites (9)

Resources (17)

Reflections (1)

### Life-size Missing Parts of 9

1st Grade Math » Unit: Understanding Subtraction
1st Grade Math » Unit: Understanding Subtraction
Oklahoma City, OK
Environment: Urban

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Standards:

Favorites (1)

Resources (15)

Reflections (1)

### Scoot for the Missing Parts of 8

1st Grade Math » Unit: Understanding Subtraction
1st Grade Math » Unit: Understanding Subtraction
Oklahoma City, OK
Environment: Urban

Big Idea:

Standards:

Favorites (5)

Resources (16)

Reflections (1)

### End of Unit Assessment

1st Grade Math » Unit: Complements of 10 and 20
1st Grade Math » Unit: Complements of 10 and 20
Waitsfield, VT
Environment: Suburban

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Resources (16)

Reflections (1)

### The Number Ten

1st Grade Math » Unit: The Number 10 and the Addition and Subtraction Concept
1st Grade Math » Unit: The Number 10 and the Addition and Subtraction Concept
Waitsfield, VT
Environment: Suburban

Big Idea:

#### Students will revisit an old routine as they work with larger groups of dots and record the number of dots that were flashed before them. Students will represent a variety of ways to represent the number 10.

Standards:

Favorites (3)

Resources (27)

Reflections (1)

1st Grade Math » Unit: Understanding Subtraction
Oklahoma City, OK
Environment: Urban

Big Idea:

Standards:

Favorites (5)

Resources (23)

Reflections (2)
Common Core Math