1.OA.D.8

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
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

CSI First Grade! Today your young investigators will try to find the missing addend while playing two different missing addend games.

 
Favorites (36)
 
Resources (15)
 
Reflections (1)
lesson image
   

Seven Apples and Bananas

1st Grade Math » Unit: Building Numbers
1st Grade Math » Unit: Building Numbers
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Possibilities are abound as students try to determine one of the possible solutions to a story problem. Although they won't be eating Apples and Bananas, Raffi would still be proud.

 
Favorites (13)
 
Resources (16)
 
Reflections (1)
lesson
   

Using 3 or More Addends to Make a Meal

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Carrie Clark
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.

 
Favorites (12)
 
Resources (14)
 
Reflections (1)
pumpkin pie
   

Missing Numbers

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

What's missing? In this lesson students will learn to find the missing number in a given math sentence.

 
Favorites (9)
 
Resources (12)
 
Reflections (1)
lesson image
   

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
Amanda Cole
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.

Standards:
 
Favorites (12)
 
Resources (17)
 
Reflections (1)
mouse
   

Cookie Mysteries

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

I use the element of mystery to get kids excited to figure out how many cookies I have to start with!

 
Favorites (10)
 
Resources (17)
 
Reflections (1)
cookie sheet
   

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
Lisa Murdock
Lakeland, FL
Environment: Urban
 
Big Idea:

It's all in the family! In this lesson, students will build fact family "houses" by using 3 numbers and writing the related addition and subtraction sentences.

 
Favorites (11)
 
Resources (12)
 
Reflections (1)
identify related facts lesson image
   

Counting On

1st Grade Math » Unit: Problem Solving Addition
1st Grade Math » Unit: Problem Solving Addition
Carrie Clark
Gilbert, IA
Environment: Rural
 
Big Idea:

Students understand counting on, but when we record our thinking do we have to record all. Of course not! This lesson is designed to get students to count on not all.

 
Favorites (7)
 
Resources (12)
 
Reflections (1)
cowgirl math2
   

The Circus Problem

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

Students connect to stories! In this lesson students work to solve a sad clown's problem by solving a start unknown story problem!

 
Favorites (7)
 
Resources (21)
 
Reflections (2)
sad clown
   

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
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Explorations of combinations! Two missing addend games and a story problem, focusing on finding combinations of 9, what else could a 1st grade teacher want.

 
Favorites (8)
 
Resources (14)
 
Reflections (1)
lesson image
   

Balancing Act

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

Incorporate technology in this lesson! Students practice balancing equations and apply their understanding of missing parts.

 
Favorites (10)
 
Resources (19)
 
Reflections (2)
scale of justice gold
   

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
Amanda Cole
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)
vegas
   

Bicycle Shop Orders

1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
1st Grade Math » Unit: Missing Parts: Unknowns in All Positions
Amanda Cole
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!

 
Favorites (3)
 
Resources (15)
 
Reflections (1)
fs 008
   

Unknown Addends

1st Grade Math » Unit: Addition Strategies
1st Grade Math » Unit: Addition Strategies
Jennifer Moon
Oklahoma City, OK
Environment: Urban
 
Big Idea:

My First Graders have been studying many addition strategies. Now I want them to use these strategies to determine an unknown number in an addition equation.

Standards:
 
Favorites (4)
 
Resources (13)
 
Reflections (1)
lesson
   

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
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Understanding the meaning of the equal sign and finding missing addends to make equations true are the big ideas today. Students engage in conversation and activities to discuss their understanding and thinking.

 
Favorites (12)
 
Resources (25)
 
Reflections (1)
lesson image
Common Core Math
 
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