## 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

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### How Many In My Hand?

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

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### Life-size Missing Parts of 9

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

Big Idea:

#### I want them to develop fluency in subtraction and get them ready for future standards like 1.NBT.C.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

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

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### Scoot for the Missing Parts of 8

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

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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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### 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:

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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