## 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)

### Finding the Hidden Addend

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

Big Idea:

Standards:

Favorites (37)

Resources (15)

Reflections (1)

### Missing Numbers

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

Big Idea:

Standards:

Favorites (13)

Resources (12)

Reflections (1)

### Seven Apples and Bananas

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

Big Idea:

Standards:

Favorites (14)

Resources (16)

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:

Standards:

Favorites (13)

Resources (17)

Reflections (1)

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

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Gilbert, IA
Environment: Rural

Big Idea:

#### Using the theme of a very YUMMY Thanksgiving meal, students will plan their own meal and figure out the cost of it.

Standards:

Favorites (12)

Resources (14)

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 (12)

Resources (17)

Reflections (1)

### Identify Related Facts - Day 2 of 2

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

Big Idea:

Standards:

Favorites (13)

Resources (12)

Reflections (1)

### Counting On

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Gilbert, IA
Environment: Rural

Big Idea:

Standards:

Favorites (7)

Resources (12)

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

Big Idea:

Standards:

Favorites (12)

Resources (19)

Reflections (2)

### 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

Big Idea:

Standards:

Favorites (7)

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

Big Idea:

Standards:

Favorites (8)

Resources (14)

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:

Standards:

Favorites (3)

Resources (15)

Reflections (1)

### 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

Big Idea:

#### It may not be Vegas, but this game will have kids thinking! Students use their understanding of missing parts to figure out if a number would fit any of their equations.

Standards:

Favorites (1)

Resources (19)

Reflections (1)

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

Big Idea:

Standards:

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

Big Idea:

Standards:

Favorites (14)

Resources (25)

Reflections (1)
Common Core Math