1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

 
106 Lesson(s)
   

3 Addends

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

When we add 3 addends we can look for a friendly combination to make our work easier

 
Favorites (19)
 
Resources (15)
 
Reflections (1)
3 addends
   

Equal or Not?

1st Grade Math » Unit: Understanding Equality
1st Grade Math » Unit: Understanding Equality
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students play an interactive game and practice crucial math fluency in this lesson on the meaning of the equals sign.

 
Favorites (22)
 
Resources (19)
 
Reflections (1)
photo 18
   

How Many Dots?

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will engage in a variety of activities that ask them to represent numbers with groups of ten and have them counting by 10s.

 
Favorites (27)
 
Resources (29)
 
Reflections (1)
lesson image
   

Adding and Subtracting Multiples of Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will apply the idea of adding or subtracting ten to a number by adding or subtracting multiple groups of ten from a number.

 
Favorites (20)
 
Resources (22)
 
Reflections (1)
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Use Addition to Check Subtraction

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:

Undo what can be undone! In this lesson, students will use addition to check subtraction to make sure their answer is correct.

 
Favorites (11)
 
Resources (12)
 
Reflections (1)
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Explain a double

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

Students can recite doubles, this lesson puts the doubles+1 strategy into action!

 
Favorites (20)
 
Resources (18)
 
Reflections (1)
explain a double
   

Identify Related Facts - Day 1 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 begin to identify and understand the relationship between addition and subtraction sentences.

 
Favorites (23)
 
Resources (12)
 
Reflections (1)
fact family sample 1
   

Using the Number Grid to Add or Subtract Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

The Number Grid Challenge. Students will play a game that requires them to add or subtract ten from a number using the number grid. They will record their results using standard notation.

 
Favorites (12)
 
Resources (20)
 
Reflections (1)
lesson image
   

Addition and Subtraction Carnival

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:

So many things to do and so little time to do them in. Students will have the opportunity to challenge their addition and subtraction skills through a variety of activity choices.

 
Favorites (11)
 
Resources (19)
 
Reflections (1)
lesson image
   

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
   

Peas and Carrots...Carrots and Peas

1st Grade Math » Unit: Properties of Addition and Subtraction
1st Grade Math » Unit: Properties of Addition and Subtraction
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students "sweat" in this difficult task where they work to find all of the combinations for 7 and 8.

 
Favorites (9)
 
Resources (15)
 
Reflections (1)
combinations image
   

Crayon Box Combinations

1st Grade Math » Unit: Properties of Addition and Subtraction
1st Grade Math » Unit: Properties of Addition and Subtraction
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students think deeply about how to make 9 using different combinations of red and blue crayons. This builds number sense and sets them up for later math fact fluency!

 
Favorites (5)
 
Resources (15)
 
Reflections (1)
photo 21
   

Doubles & Doubles +1 Practice

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

Doubles and doubles +1 are two strategies that 1st graders use to help them solve their basic facts and even two-digit addition

 
Favorites (15)
 
Resources (13)
 
Reflections (2)
doubles doubles plus 1
   

Counting Back

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:

Smack down! In this lesson students will learn how to count back to subtract.

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

10 and Some More

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

Your students will play a game where they combine two single digit numbers and then record that total in terms of how it relates to ten.

 
Favorites (6)
 
Resources (20)
 
Reflections (1)
lesson image
Common Core Math
 
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