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 Lessons
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What Is An Array2nd Grade Math» Unit:Getting Ready to Multiply
2nd Grade Math
» Unit:
Getting Ready to Multiply
Big Idea:Repeated addition lays the foundation for multiplication.
Colorful Building Arrays2nd Grade Math» Unit:Getting Ready to Multiply
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 Arrays2nd Grade Math» Unit:Getting Ready to Multiply
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 Arrays2nd Grade Math » Unit: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 Arrays2nd Grade Math » Unit: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
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 Arrays2nd Grade Math » Unit: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 Olympics2nd Grade Math » Unit:Arrays
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 Arrays2nd Grade Math » Unit: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 Strategies2nd Grade Math» Unit:Strategies That Work
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 Middle2nd Grade Math» Unit:Area, Perimeter and More Measurement
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
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 Too2nd Grade Math» Unit:Numbers Have Patterns
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 Poster2nd Grade Math » Unit:Arrays
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.