Unit 2: Building a Conceptual Understanding of Addition and Subtraction

Lesson 1: Leaf Collecting

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 2: FALLing Leaves!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 3: Bear Is Hibernating

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 4: Silly Bear!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 5: Bird Watching With Johnny Appleseed!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 6: Johnny Appleseed's Seedlings

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 7: A Walk in the Woods

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 8: Apple Picking!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 9: The Old Lady And The Leaves

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 10: The Old Lady And The Pumpkins

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 11: The Old Lady Ate MORE Leaves!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 12: Shirts and More Shirts!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting back, decomposing to 10, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 13: The  Old Lady and The Pants

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use strategies such as counting on, making ten, using relationship between addition and subtraction, number lines, or using known facts.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 14: Balancing Apples

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use more than one strategy, including objects and drawings.

• I can use math tools and representations to apply my understanding of the commutative property.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 15: Balancing  More Apples

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use more than one strategy, including objects and drawings.

• I can use math tools and representations to apply my understanding of the commutative property.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 16: From Seed To Pumpkin

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use more than one strategy, including objects and drawings.

• I can use math tools and representations to apply my understanding of the commutative property.

• Video Links

  • WCPSS Addition Count On Strategy

  • WCPSS Subtraction Break Apart Lines Strategy 

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Ten Frame

  • Two Color Counters

  • Number Chart

Lesson 18: Solving Problems With Number Lines!

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1st Grade Unpacking Document

• I can add and subtract within 20.

• I can use more than one strategy, with a focus on using the number line.

• Video Links

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Number Lines

Lesson 19: Math Stations (Day 1)

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1st Grade Unpacking Document

• I can use math tools and representations to apply my understanding of the commutative property.

• I can add and subtract within 20, using a variety of strategies.

• I can organize and interpret data.

• Video Links

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Number Lines

Lesson 20: Math Stations (Day 2)

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1st Grade Unpacking Document

• I can use math tools and representations to apply my understanding of the commutative property.

• I can add and subtract within 20, using a variety of strategies.

• I can organize and interpret data.

• Video Links

  • WCPSS Add and Subtract Using A Number Line

  • WCPSS Subtraction Back Down Through 10

• Virtual Manipulatives

  • Number Lines