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- 2.OA.C.3Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.
- 2.OA.C.4Use 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.

What Is An Array

2nd Grade Math

» Unit:

Getting Ready to Multiply

Big Idea:Repeated addition lays the foundation for multiplication.

Colorful Building Arrays

2nd Grade Math

» Unit:

Getting Ready to Multiply

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.

Heartfelt Arrays

2nd Grade Math

» Unit:

Getting Ready to Multiply

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

Writing Equations for Arrays

2nd Grade Math

» Unit:

Arrays

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.

Skittle Arrays

2nd Grade Math

» Unit:

Arrays

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

Building Arrays

2nd Grade Math

» Unit:

Arrays

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

Drawing Arrays

2nd Grade Math

» Unit:

Arrays

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.

The Arrays Olympics

2nd Grade Math

» Unit:

Arrays

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.

Explaining Our Equations and Writing about Arrays

2nd Grade Math

» Unit:

Arrays

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"

Division Strategies

2nd Grade Math

» Unit:

Strategies That Work

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

Filling in the Middle

2nd Grade Math

» Unit:

Area, Perimeter and More Measurement

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

3-Digit Perimeters

2nd Grade Math

» Unit:

Area, Perimeter and More Measurement

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

Doubles and Halves are Patterns Too

2nd Grade Math

» Unit:

Numbers Have Patterns

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

My Arrays Poster

2nd Grade Math

» Unit:

Arrays

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

2.OA.C.3

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

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.