Code | Description | |
MA.2.AR.3.1: | Represent an even number using two equal groups or two equal addends. Represent an odd number using two equal groups with one left over or two equal addends plus 1.
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MA.2.AR.3.2: | Use repeated addition to find the total number of objects in a collection of equal groups. Represent the total number of objects using rectangular arrays and equations.
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Access Point Number | Access Point Title |
MA.2.AR.3.AP.1: | Explore the concept of odd and even by pairing objects to represent an even number using two equal groups or represent an odd number by using two equal groups with one left over. Group of objects may not exceed 20. |
MA.2.AR.3.AP.2: | Explore using repeated addition to find the total number of objects represented in a collection of equal groups (e.g., 3 groups of 2 objects) or in a rectangular array (e.g., 3 rows of 2 objects). Total objects may not exceed 20. |
Name | Description |
Destinee Dragon’s Donut Troubles: Arrays: | Help Destinee use arrays and repeated addition to find how many donuts that she has in this interactive tutorial. |
Beach Buddies: Even or Odd? : | Come explore even and odd numbers of objects and learn to determine if a group of objects has an even or odd number in this beach-themed, interactive tutorial. |
Name | Description |
Counting By Rows or Columns: | Students are asked to make an array from pennies and then skip count to find the total number of pennies and write an addition equation to represent the array. |
All Your Penguins in a Row: | Students are asked count by rows or columns to determine the total number in an array and then write an addition equation to represent the array. |
Writing an Equal Addends Equation: | Students are asked to write an equal addends equation that corresponds to a given array. |
Counting an Array: | Students are asked to find the total number of objects in a 3 x 4 array. |
Showing a Collection as Odd or Even: | Students are asked to determine if each of two collections has an odd or even number of objects, and to explain how they made their decisions. |
How Do You Know if a Number is Even or Odd?: | Students are asked to determine if a given number is even or odd. |
Is it Even or Odd?: | Students are asked to determine if a given number is even or odd. |
Even Numbers as the Sum of Two Equal Addends: | Students are asked to write even numbers within 20 as the sum of two equal addends. |
Name | Description |
Is It Odd or Even?: | This lesson will introduce students to the concept of odd and even numbers. The lesson will show that objects that can be grouped by 2's (in pairs) represent even numbers and objects that cannot be grouped in pairs (have 1 left over) represent odd numbers. The lesson will also address two-digit numbers (up to 20) to show that the place value of the number in the ones place determines whether a two-digit number is odd or even. |
Hooray Equal Groups: | Students will learn how to represent and count equal groups through the use of literature and situational story problems. Using the book Each Orange Had 8 Slices, students will use manipulatives to find the total number of objects in a collection of equal groups. Students will learn to write corresponding repeated addition equations. |
"Even" and "Odd" Go on a Picnic: | In this lesson, the class will be guided through representing even numbers using two equal groups and odd numbers as two equal groups with one left over. Students will explore various strategies for representing numbers that are even or odd based on whether they can be divided into two equal teams for a kickball game or whether everyone will have a buddy to pair up with on the picnic. Students will explore writing addition expressions to represent even numbers as two equal addends and odd numbers as two equal addends plus 1. |
Cookies for All: | This lesson allows students to use everyday objects to understand equal groups by representing a total number of objects using rectangular arrays and repeated addition equations. The lesson uses "The Doorbell Rang" by Pat Hutchins to engage students during the lesson and to make a connection by using literacy in mathematics. This lesson will provide a foundation for the conceptual understanding of division by creating equal groups using arrays and repeated addition. |
Déjà Vu Addition, 2 plus 2 plus 2: | This lesson illustrates that when you have a rectangular array of objects, you can determine the sum of the objects by using a repeated addition equation. This builds a foundation for multiplication. |
Odds and Evens Dodgeball: | Students will create groups of objects to determine if a number is even or odd. |
Array Addition: | This is a lesson in which students will practice making rectangular arrays and writing equations, with and without story problems, using repeated addition to find the total number of objects in each array. This lesson is designed to help prepare students for multiplication. |
I Array + You Array = Arrays!: | An engaging activity that includes using repeated addition to find the total number of objects in equal groups and representing the total number of objects using arrays and equations. |
Odds and Evens: | This resource helps students identify numbers as odd or even using a variety of methods including creating pairs, skip counting by two’s, using number lines, and arrays. It also leads them to understand that all even numbers can be written as a sum of equal addends and odds can be written as the sum of equal addends plus one. This resource can be conducted as one lesson or can be spread over multiple mini sessions if needed as noted within this resource as Lesson 1 and Lesson 2. |
Name | Description |
The Van de Walle Dot Matrix: A tool to support concepts from counting to multiplying polynomials: | Unlock an effective teaching tool that can help students all the way from basic counting principles to multiplying polynomials. Dot Matrix sheet is available for dowload here. |
Equations on the Math Balance: | Unlock an effective teaching strategy for teaching inequalities and equations with the math balance in this Teacher Perspectives video for educators. |
Name | Description |
Red and Blue Tiles: | This task is specifically written so that students have opportunities to use different strategies to determine whether a set has an even or odd number of objects. |
Counting Dots in Arrays: | Students who work on this task will benefit in seeing that given a quantity, there is often more than one way to represent it, which is a precursor to understanding the concept of equivalent expressions. This particular question also lays a foundation for students to understand the commutative property of multiplication in third grade. This task would be much more valuable if included in an appropriate place in an instructional sequence than as an isolated task. |
Title | Description |
Destinee Dragon’s Donut Troubles: Arrays: | Help Destinee use arrays and repeated addition to find how many donuts that she has in this interactive tutorial. |
Beach Buddies: Even or Odd? : | Come explore even and odd numbers of objects and learn to determine if a group of objects has an even or odd number in this beach-themed, interactive tutorial. |
Title | Description |
Red and Blue Tiles: | This task is specifically written so that students have opportunities to use different strategies to determine whether a set has an even or odd number of objects. |
Counting Dots in Arrays: | Students who work on this task will benefit in seeing that given a quantity, there is often more than one way to represent it, which is a precursor to understanding the concept of equivalent expressions. This particular question also lays a foundation for students to understand the commutative property of multiplication in third grade. This task would be much more valuable if included in an appropriate place in an instructional sequence than as an isolated task. |
Title | Description |
Red and Blue Tiles: | This task is specifically written so that students have opportunities to use different strategies to determine whether a set has an even or odd number of objects. |
Counting Dots in Arrays: | Students who work on this task will benefit in seeing that given a quantity, there is often more than one way to represent it, which is a precursor to understanding the concept of equivalent expressions. This particular question also lays a foundation for students to understand the commutative property of multiplication in third grade. This task would be much more valuable if included in an appropriate place in an instructional sequence than as an isolated task. |