2.OA.C.4

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

 
14 Lesson(s)
   

What Is An Array

2nd Grade Math » Unit: Getting Ready to Multiply
2nd Grade Math » Unit: Getting Ready to Multiply
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Repeated addition lays the foundation for multiplication.

 
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Resources (14)
images 1 2 37 47 pm
   

Colorful Building Arrays

2nd Grade Math » Unit: Getting Ready to Multiply
2nd Grade Math » Unit: Getting Ready to Multiply
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Ever think of a city street as an endless display of arrays? In this lesson students will begin to recognize how often our world is organized in arrays.

Standards:
 
Favorites (8)
 
Resources (12)
 
Reflections (1)
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Heartfelt Arrays

2nd Grade Math » Unit: Getting Ready to Multiply
2nd Grade Math » Unit: Getting Ready to Multiply
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Is there a way to make sure everyone gets the same amount of something? How about the classic array?

Standards:
 
Resources (10)
 
Reflections (1)
images 2
   

Writing Equations for Arrays

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

After spending several days building and drawing arrays, students use what they know about adding groups to create repeated addition number sentences to represent their arrays.

 
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Resources (15)
 
Reflections (1)
url
   

Skittle Arrays

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

In this lesson students use knowledge of rows and columns to build simple arrays using skittles or other small objects

Standards:
 
Favorites (11)
 
Resources (18)
 
Reflections (1)
1280px skittles candies pile
   

Building Arrays

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

In this lesson, students use the vocabulary columns and rows to build simple arrays using their bodies and counters.

 
Favorites (11)
 
Resources (16)
 
Reflections (1)
url 1
   

Drawing Arrays

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students use their knowledge of columns and rows to draw arrays. In the previous days, students built arrays--drawing arrays is a more abstract skill that forces students to visualize the array and internalize the concept of columns and rows.

 
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Resources (16)
 
Reflections (1)
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The Arrays Olympics

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students take everything they have learned about arrays and use it to compete in the arrays Olympics!! This review lesson allows time for arrays re-teaching and practice.

 
Favorites (2)
 
Resources (10)
 
Reflections (1)
images
   

Explaining Our Equations and Writing about Arrays

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students work to use words to explain why multiple number sentences all describe an array. Students use a criteria for success to help craft an "excellent mathematical equation"

Standards:
 
Favorites (4)
 
Resources (13)
 
Reflections (1)
pencils hb
   

Filling in the Middle

2nd Grade Math » Unit: Area, Perimeter and More Measurement
2nd Grade Math » Unit: Area, Perimeter and More Measurement
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Perimeter is the outside, and area is the inside of a figure. Students can use both concepts to work with geometric shapes.

 
Favorites (1)
 
Resources (11)
 
Reflections (1)
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Division Strategies

2nd Grade Math » Unit: Strategies That Work
2nd Grade Math » Unit: Strategies That Work
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

It is time to add a new strategy - division of objects into equal groups - to the student's repertoire.

 
Favorites (1)
 
Resources (13)
 
Reflections (1)
images 2
   

3-Digit Perimeters

2nd Grade Math » Unit: Area, Perimeter and More Measurement
2nd Grade Math » Unit: Area, Perimeter and More Measurement
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Students work with 3-digit numbers as they solidify their understanding of the difference between perimeter and area.

 
Resources (12)
 
Reflections (1)
screen shot 2014 05 07 at 8 12 35 am
   

Doubles and Halves are Patterns Too

2nd Grade Math » Unit: Numbers Have Patterns
2nd Grade Math » Unit: Numbers Have Patterns
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Can you double an odd number? Can you cut it in half? Patterns in doubles and halves help to answer these questions.

 
Resources (13)
 
Reflections (1)
images
   

My Arrays Poster

2nd Grade Math » Unit: Arrays
2nd Grade Math » Unit: Arrays
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students make a poster with their own arrays and write at least two equations for each array!

Standards:
 
Favorites (4)
 
Resources (15)
 
Reflections (1)
sample student work group
Common Core Math
 
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