Unit 2: Adding and Subtracting within 100

Lesson 1:  The Candy Jar

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2nd Grade Unpacking Document

• I can demonstrate fluency within addition by making connections between partners of 10 and partners of 100.

• Video Links:

  • Khan Academy Getting to 10 by Filling Boxes

Lesson 2: Pokémon, Go!

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2nd Grade Unpacking Document

• I can solve word problems within 100 using my knowledge of place value.

• Video Links:

  • WCPSS Addition Using Proof Drawings

  • WCPSS Subtraction Using Proof Drawings

• Virtual Manipulatives:

  • Number Pieces

Lesson 3: Mental Math Strategies

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2nd Grade Unpacking Document

• I can use place value strategies to add and subtract efficiently.

• Video Links:

  • WCPSS Addition Using Proof Drawings

  • WCPSS Subtraction Using Proof Drawings

• Virtual Manipulatives:

  • Number Pieces

Lesson 4: Frankie’s Number Strings

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2nd Grade Unpacking Document

• I can make connections between skip counting and addition, decomposing numbers, adding flexibly and efficiently.

• Video Links:

  • WCPSS Addition Using Proof Drawings

  • WCPSS Subtraction Using Proof Drawings

• Virtual Manipulatives:

  • Number Pieces

Lesson 5: Parking Lot-Break Apart Make Ten

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2nd Grade Unpacking Document

• I can think flexibly, decomposing numbers to solve addition problems more efficiently.

• Video Links:

  • WCPSS Decomposing a Number to Make a Ten for 2–Digit Addition

Lesson 6: Making Tens…Making Problems Easier

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2nd Grade Unpacking Document

• I can begin to demonstrate fluency with addition within 100 by using strategies to demonstrate my understanding of the partners within 100.

• Video Links:

  • WCPSS Decomposing a Number to Make a Ten for 2–Digit Addition

• Virtual Manipulatives:

  • Number Pieces

Lesson 7:  Using Addition to Solve Subtraction

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2nd Grade Unpacking Document

• I can solve subtraction problems using the relationship between addition and subtraction.

• Video Links:

  • WCPSS Math Relationships Between Addition and Subtraction

Lesson 8: Subtraction Strategies-Decomposing Strategies

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2nd Grade Unpacking Document

• I can compose and decompose quantities to solve subtraction problems more efficiently.

• Video Links:

  • WCPSS Subtraction Using Proof Drawings

• Virtual Manipulatives:

  • Number Pieces

Lesson 9: Subtraction Strategies-All Together Now

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2nd Grade Unpacking Document

• I can use strategies based on place value and properties of operations to solve problems.

• Video Links:

  • WCPSS Commutative Property of Addition

  • WCPSS Associative Property of Addition

• Virtual Manipulatives:

  • Number Pieces

Lesson 10: Structures of Equations- Numberless Story Situations

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2nd Grade Unpacking Document

• I can analyze, represent, and solve word problems.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

Lesson 11: Structures of Equations- Situations and Solutions

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2nd Grade Unpacking Document

• I can analyze, represent, and solve word problems.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

Lesson 12: The Pringle Ringle

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2nd Grade Unpacking Document

• I can analyze, represent, and solve word problems.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

Lesson 13: Subtraction Strategies 

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2nd Grade Unpacking Document

• I can analyze, represent, and solve word problems.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

Lesson 14: Big Sister, Little Sister

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2nd Grade Unpacking Document

• I can represent, analyze, and solve word problems using my knowledge of place value.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

Lesson 15: Solving Problems with a Number Line

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2nd Grade Unpacking Document

• I can solve sums and differences through the use of a number line.

• Video Links:

  • Addition on a Number Line Video

  • WCPSS 2-Digit Addition Using a Number Line

  • WCPSS 2-Digit Subtraction Using a Number Line

• Virtual Manipulatives:

  • Number Line

Lesson 16: Friendship Bracelets 

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2nd Grade Unpacking Document

• I can solve sums and differences through the use of a number line.

• Video Links:

  • Addition on a Number Line Video

  • WCPSS 2-Digit Addition Using a Number Line

  • WCPSS 2-Digit Subtraction Using a Number Line

• Virtual Manipulatives:

  • Number Line

Lesson 17: Solving Story Problems on an Open Number Line

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2nd Grade Unpacking Document

• I can solve sums and differences through the use of a number line.

• Video Links:

  • Addition on a Number Line Video

  • WCPSS 2-Digit Addition Using a Number Line

  • WCPSS 2-Digit Subtraction Using a Number Line

• Virtual Manipulatives:

  • Number Line

Lesson 18: Mental Math Strategies

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2nd Grade Unpacking Document

• I can solve addition (and subtraction) problems, building fluency where I will mentally add and subtract 10 from a given number through 100.

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 19: Target Zero

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2nd Grade Unpacking Document

• I can solve subtraction (and addition) problems, building fluency where I will mentally add and subtract 10 from a given number through 100.

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 20: Add To/Take From Story Situations

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2nd Grade Unpacking Document

• I can analyze, represent, and solve addition and subtraction word problems demonstrating fluency.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 21: Comparison Problems

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2nd Grade Unpacking Document

• I can analyze, represent, and solve addition and subtraction word problems demonstrating efficiency and fluency.

• Video Links:

  • Bar Models

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 22: Push Up Challenge

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2nd Grade Unpacking Document

• I can use strategies to solve problems involving three addends.

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 23: The Candy Bowl

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2nd Grade Unpacking Document

• I can use strategies to add up to three two-digit numbers.

• Virtual Manipulatives:

  • Number Pieces

  • Number Line

Lesson 24: Stringing Along Numbers!

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2nd Grade Unpacking Document

• I can use strategies to add up to three two-digit numbers.

• Virtual Manipulatives:

  • Number Pieces

  • Number Line