## Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

29 Lesson(s)

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

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Resources (15)

Reflections (1)

### Seven Apples and Bananas

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

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Resources (16)

Reflections (1)

### Using 3 or More Addends to Make a Meal

Gilbert, IA
Environment: Rural

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Resources (14)

Reflections (1)

### If you give a mouse a cookie...

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

Big Idea:

#### Who doesn't love Laura Numeroff''s If You Give a Mouse a Cookie?! Connect to that well loved story and play a cookie themed game to practice start unknown subtraction problems.

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Resources (17)

Reflections (1)

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

Big Idea:

Standards:

Favorites (10)

Resources (17)

Reflections (1)

### Missing Numbers

Lakeland, FL
Environment: Urban

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Resources (12)

Reflections (1)

### Counting On

Gilbert, IA
Environment: Rural

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Resources (12)

Reflections (1)

### Identify Related Facts - Day 2 of 2

Lakeland, FL
Environment: Urban

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Resources (12)

Reflections (1)

### The Circus Problem

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

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Standards:

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Resources (21)

Reflections (2)

### Combinations, Day 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

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Standards:

Favorites (8)

Resources (14)

Reflections (1)

### Balancing Act

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

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Resources (19)

Reflections (2)

### Pick a Card, Any Card!

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

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Standards:

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Resources (19)

Reflections (1)

### Bicycle Shop Orders

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
New Orleans, LA
Environment: Urban

Big Idea:

#### Incorporate dramatic play into your math block with this imaginative lesson! Students pretend they are taking orders in a bike shop-with each problem they have another missing part to find!

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Resources (15)

Reflections (1)

Oklahoma City, OK
Environment: Urban

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Favorites (4)

Resources (13)

Reflections (1)

### Is It True or Is It False?

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

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Standards:

Favorites (11)

Resources (25)

Reflections (1)
Common Core Math