Second Grade Operations and Algebraic Thinking

Domain: Operations and Algebraic Thinking
Teacher Notes/Second Grade Home/Number Sense Routines/Read It, Draw It, Solve It
2.OA.A.1 2.OA.B.2 2.OA.C.3 2.OA.C.4
Essential Skills and Knowledge	Teacher Resources	Student Resources
2.OA.A.1 Represent and solve problems involving addition and subtraction.
Use addition and subtraction within 100 to solve one- and two- step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. "I Can" Statements: I can identify the number of steps to solve a word problem. I can identify an unknown number in an equation using addition and subtraction up to 100. I can identify the strategy/strategies for solving word problems. I can use addition and/or subtraction to solve 2 step word problems within 100.	Curriculum: Put Together Take Apart Put Together Take Apart (T1U4Q9) Note: AACPS Nearpod account required. Contact OIT Comparison Bar Model (T1U4Q12) Comparison Bar Model Google Slides PowerPoint (T1U4Q12) Two Step Notebook (T1U4Q13) Two Step Problems Google Slides PowerPoint (T1U4Q13) Wixie: *Teachers login to Wixie, select link, and then assign to students.* Number Line Practice One Hundred Chart Word Problem Practice Learn Zillion: *Prior to selecting the link, login to Learn Zillion .* Understand a Word Problem (T1U4Q6) Solve word problems by making a model Solve word problems by counting Solve word problems by making an easier problem Solve word problems by comparing Solve two-step word problems Solve two-step problems by making a model Solve two-step problems by writing an equation Understand word problems by creating fill-in-the-blank sentences Solve word problems by drawing picture models Solve word problems by drawing bar models Solve word problem with missing parts by drawing bar models Solving a multi-step word problem with a bar model Organize information in a multi-step word problem by drawing a bar model Write equations to solve word problems Additional Resources: Addition/Subtraction within 100 Word Problem Generator Videos: *Discovery: Prior to selecting the link, login to Discovery Education (aacps.discoveryeducation.com)* Math Monsters: Landmark Numbers and Number Lines Missing Part of a Whole SMART Notebooks: 2.OA.A.1 Review Joining Stories The Napping House Back Down From 10 Build Up to 10 Break Apart Numbers Comparing Numbers Related Facts 2-Step Addition and Subtraction Problems Teaching Student-Centered Mathematics for 2.OA.1 Hands On Standards for 2.OA.1 Fact Houses Fact Families Stranger in the Family Gumball Math Addition and Subtraction Road Trip! Story Problems - Choose the Operation Number Line Find the Missing Number Part-Part-Whole Problem Solving Missing Number - Choose a Strategy! Problem Solving (PowerPoint) Number Sentence	Addition Word Problems Subtraction Number Sentences BeeHive Adding and Subtracting Game Thinking Blocks How Many? Word Problem Generator Part/Part/Whole Word Problems
2.OA.B.2 Add and subtract within 20.
Fluently add and subtract within 20 using mental strategies. By the end of grade 2, known from memory all sums of two one-digit numbers. "I Can" Statements: I can know from memory all sums and differences of 2 one-digit numbers within 20. I can use mental strategies to add and subtract fluently within 20.	Curriculum: Fish Problems Fish Problems Google Slides PowerPoint Wixie: *Teachers login to Wixie, select link, and then assign to students.* Add 10 Word Problems Fact Family Practice Learn Zillion: Prior to selecting the link, login to Learn Zillion. Add and subtract on a number line Add and subtract using fact families Adding and subtracting using doubles facts Add by making a ten Subtract by counting down to ten Subtract by counting up to ten Add and subtract within 20 on an open number line Add within 20 by regrouping on a ten frame Subtract within 20 using 10 frames Subtract by finding the difference on a number line Use doubles to add and subtract within 20 Additional Resources: Missing # (Google Form Quiz - Click link, Make a copy, select Form > Edit Form, share Form with studnets - graded automatically) Missing # Addition/Subtraction within 100 Videos: *Discovery: Prior to selecting the link, login to Discovery Education (aacps.discoveryeducation.com)* Math Monsters: Doubles and Their Neighbors Inverse Operations SMART Notebooks: 2.OA.B.2 Review 1-Digit Addition Facts Doubles, No Trouble Doubles and Doubles Plus 1 Making 10 Game 2-Step Problem - Add 3 Subtraction Fact Platters Snowman Number line 10-Frames Addition 10-Frames: Add with Counters Adding Doubles Part Part Whole Mat	Scratch 'Em Off Save the Whale Adding One, Two, or Three Digit Numbers How Many? Ten Frame Mania Break Apart Adding with Ten-Frames Rule Out Extra Information Bumble Numbers 1 Bumble Numbers 2
2.OA.C.3 Work with equal groups of objects to gain foundations for multiplication.
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 2's; write an equation to express an even number as a sum of two equal addends. "I Can" Statements: I can count a group of objects up to 20 by 2's. I can recognize groups that have even numbers of objects will pair evenly up to 20. I can recognize groups that have odd numbers of objects will not pair evenly up to 20. I can determine whether a group of objects is off or even using a strategy. I can prove that all even numbers can be formed from the addition of two equal addends. I can write an equation to express a given even number as a sum of two equal addends.	Curriculum: Learn Zillion: Prior to selecting the link, login to Learn Zillion. Recognize even and odd numbers by forming partners and equal groups Understand and explain even-odd number patterns using a number line Write even numbers as the sum of two equal addends Write and test equations with two even addends to prove that the sum will always be even Use the digit in the ones place to determine if a number is even or odd Determine whether a group contains an even or odd number of objects by pairing Determine whether a group contains an even or odd number of objects by creating equal groups Determine whether a group contains an even or odd number of objects by looking at the digit in the ones place Write an equation to show an even number Additional Resources: Addition/Subtraction within 100 Even and Odd: Defined Even and Odd Practice Videos: *Discovery: Prior to selecting the link, login to Discovery Education (aacps.discoveryeducation.com)* The Number Crew: Drinks For All Even and Odd	Odd and Even Odd and Even Game Odd Even Fruit Splat Odd or Even Monkey Drive Odd or Even Number Ninja Odd and Even Math Games
2.OA.C.4 Work with equal groups of objects to gain foundations for multiplication.
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. "I Can" Statements: I can identify a rectangular array with up to 5 rows and up to 5 columns. I can understand that arrays can be written as repeated addition problems. I can write and solve repeated addition problems to find the number of objects using rectangular arrays.	Curriculum: Learn Zillion: Prior to selecting the link, login to Learn Zillion. Understanding arrays Use repeated addition to find the total number of objects in an array Create arrays by modeling equal addends Read arrays by skip counting Additional Resources: Addition/Subtraction within 100 Wixie: Teachers Login to Wixie, select link, and then assign to students. Addition Facts Addition Sets Domino Adding Domino Houses Space Addition Dice Subtraction Subtraction Associative Property What is My Sign? Videos: *Discovery: Prior to selecting the link, login to Discovery Education (aacps.discoveryeducation.com)* Introduction to Arrays Video- Intro to Multiplication Multiplication Rap Song Repeated Addition - Zoo Feeding Time Google Slides PowerPoint SMART Notebooks: Arrays Repeated Addition - Zoo Feeding Time Repeated Addition Practice Addition/Multiplication Fact Families Strategies to Solve	Repeated Addition Video & Practice Race Car Repeated Addition Carl's Cookie Capers Camel Repeated Addition/Multiplication Game Knights of Math Multiplication Groups of Dogs

Teacher Notes

Operations and Algebraic Thinking Activities	Website/Activity	Content Standards/Technology Standards
Represent and solve problems involving addition and subtraction.	Add and subtract within 100 to solve word problems Solve addition and subtraction word problems by drawing models LearnZillion Videos Custer 1 Review Cluster 2 Review Joining Stories The Napping House (calculator) Back Down From 10 Build Up to 10 Break Apart Numbers Comparing Numbers Related Facts 2-step addition and subtraction problems Teaching Student Centered Mathematics for 2.OA.1 Hands on Standards Fact Houses Fact Families Stranger in the Family Gumball Math Addition and Subtraction Road Trip! Problem Solving Story Problems - Choose the Operation Number Sentence Number Line Math Monsters: Landmark Numbers and Number Lines Find the Missing Number Part-Part-Whole Problem Solving Missing Part of a Whole Missing Number - Choose a Strategy! Algebra Balancing Act Problem Solving Pencil and Sticker Apple Farm Word Problems Sheep & Duck Word Problems (Student Centers) Addition Word Problems Subtraction Number Sentences BeeHive Adding and Subtracting Game Thinking Blocks	Common Core: 2.OA.1 Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns n all positions, e.g., by suing drawings, and equations with a symbol for the unknown number to represent the problem. Technology \| ISTE Standards Addressed: 1. Empowered Learner, 2. Digital Citizen, 3. Knowledge Constructor, 5. Computational Thinker
Add and subtract within 20.	Add and subtract within 20 Use mental strategies to add and subtract within 20 Learn Zillion Videos 1-Digit Addition Facts Math Monsters: Doubles and Their Neighbors Doubles, No Trouble Doubles and Doubles Plus 1 Making 10 game 2-Step Problem - Add 3 Subtraction Fact Platters Snowman Number line 10 Frames Addition Inverse Operations Two of Everything Seeing Doubles Lesson Finding Fact Families Lesson (Student Centers) Save the Whale Base Ten Bear Math Lines Adding One, Two, or Three Digit Numbers Find the Sum-3 Addends Missing Addends Number Sentence Subtraction Rule Out Extra Information Bumble Numbers 1 Bumble Numbers 2	Common Core: 2.OA.B.2 Fluently add and subtract within 20 using mental strategies. By the end of Grade 2, know from memory all sums of two one-digit numbers. Technology \| ISTE Standards Addressed: 1. Empowered Learner, 2. Digital Citizen, 3. Knowledge Constructor, 5. Computational Thinker
Work with equal groups of objects to gain foundations for multiplication.	Understand even and odd numbers by creating groups and using the digit in the ones place Understand even and odd numbers and prove that a number is even LearnZillion Videos Odd and Even Numbers Even and Odd Defined Even and Odd Practice The Number Crew: Drinks For All Even and Odd Odd Man Out Lesson (Student Centers) Odd and Even Odd and Even Game Odd and Even Math Games Odd Todd/ Even Steven Jerseys	Common Core: 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. Technology \| ISTE Standards Addressed: 1. Empowered Learner, 2. Digital Citizen, 3. Knowledge Constructor, 5. Computational Thinker
	Write equations that use addition to find the total number of objects in an array LearnZillion Videos Introduction to Arrays Arrays Repeated Addition Pictures and Problems Repeated Addition Practice Video- Intro to Multiplication Multiplication Rap Song Word Problems- Wheel Shop Level A (Student Centers) Race Car Repeated Addition Carls Cookie Capers Camel Repeated Addition/Multiplication Game Wade's Workout Multiplication Game Knights of Math Multiplication Groups of Dogs (Wixie Resources) Addition Facts Addition Sets Domino Adding Domino Houses Space Addition Dice Subtraction Subtraction Associative Property What is My Sign?	Common Core: 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. Technology \| ISTE Standards Addressed: 1. Empowered Learner, 2. Digital Citizen, 3. Knowledge Constructor, 5. Computational Thinker

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