Thinking Deeper about Addition and Subtraction—The Unknown Number Lessons - Applications in Operations Within 100

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Common Core State Standards
- English Language Arts
  - Kindergarten
    - Reading: Literature
    - Reading: Informational Text
    - Reading: Foundational Skills
      - Print Concepts
        
        RF.K.1
        
        RF.K.1.A
        
        RF.K.1.B
        
        RF.K.1.C
        
        RF.K.1.D
      - Phonological Awareness
        
        RF.K.2
        
        RF.K.2.A
        
        RF.K.2.C
        
        RF.K.2.D
      - Phonics and Word Recognition
        
        RF.K.3
        
        RF.K.3.A
        
        RF.K.3.B
        
        RF.K.3.C
        
        RF.K.3.D
      - Fluency
        
        RF.K.4
    - Writing
      - Text Types and Purposes
        
        W.K.3
    - Language
      - Conventions of Standard English
        
        L.K.1
        
        L.K.1.B
        
        L.K.1.C
        
        L.K.1.D
        
        L.K.1.E
        
        L.K.1.F
        
        L.K.2
        
        L.K.2.A
        
        L.K.2.B
        
        L.K.2.C
        
        L.K.2.D
      - Vocabulary Acquisition and Use
        
        L.K.4
        
        L.K.4.A
        
        L.K.4.B
        
        L.K.5
        
        L.K.5.A
        
        L.K.5.B
        
        L.K.5.C
        
        L.K.5.D
    - Speaking & Listening
      - SL.K.2
      - SL.K.4
  - Grade 1
    - Reading: Literature
    - Reading: Informational Text
    - Reading: Foundational Skills
      - Print Concepts
        
        RF.1.1
        
        RF.1.1.A
      - Phonological Awareness
        
        RF.1.2
        
        RF.1.2.A
        
        RF.1.2.B
        
        RF.1.2.C
        
        RF.1.2.D
      - Phonics and Word Recognition
        
        RF.1.3
        
        RF.1.3.A
        
        RF.1.3.B
        
        RF.1.3.C
        
        RF.1.3.D
        
        RF.1.3.E
        
        RF.1.3.F
        
        RF.1.3.G
      - Fluency
        
        RF.1.4
        
        RF.1.4.A
        
        RF.1.4.C
    - Language
      - Conventions of Standard English
        
        L.1.1
        
        L.1.1.B
        
        L.1.1.C
        
        L.1.1.D
        
        L.1.1.E
        
        L.1.1.F
        
        L.1.1.G
        
        L.1.1.H
        
        L.1.1.I
        
        L.1.1.J
        
        L.1.2
        
        L.1.2.A
        
        L.1.2.B
        
        L.1.2.C
      - Vocabulary Acquisition and Use
        
        L.1.4
        
        L.1.4.A
        
        L.1.4.B
        
        L.1.4.C
        
        L.1.5
        
        L.1.5.A
        
        L.1.5.B
        
        L.1.5.C
        
        L.1.5.D
    - Speaking & Listening
      - SL.1.1
        
        SL.1.1.B
        
        SL.1.1.C
      - SL.1.4
  - Grade 2
  - Grade 3
    - Reading: Literature
    - Reading: Informational Text
    - Reading: Foundational Skills
      - Phonics and Word Recognition
        
        RF.3.3
        
        RF.3.3.A
        
        RF.3.3.B
        
        RF.3.3.C
        
        RF.3.3.D
      - Fluency
        
        RF.3.4
        
        RF.3.4.A
        
        RF.3.4.B
    - Writing
      - Text Types and Purposes
        
        W.3.2
        
        W.3.2.A
        
        W.3.2.C
        
        W.3.3
        
        W.3.3.C
    - Language
      - Conventions of Standard English
        
        L.3.1
        
        L.3.1.A
        
        L.3.1.B
        
        L.3.1.C
        
        L.3.1.D
        
        L.3.1.E
        
        L.3.1.F
        
        L.3.1.G
        
        L.3.1.H
        
        L.3.1.I
        
        L.3.2
        
        L.3.2.A
        
        L.3.2.B
        
        L.3.2.C
        
        L.3.2.D
        
        L.3.2.E
        
        L.3.2.F
      - Vocabulary Acquisition and Use
        
        L.3.4
        
        L.3.4.A
        
        L.3.4.B
        
        L.3.4.C
        
        L.3.5
        
        L.3.5.A
        
        L.3.5.B
    - Speaking & Listening
      - SL.3.1
        
        SL.3.1.A
        
        SL.3.1.B
        
        SL.3.1.C
      - SL.3.4
- Math
  - Kindergarten
    - Counting and Cardinality
      - K.CC.A
        
        K.CC.A.1
        
        K.CC.A.2
      - K.CC.B
        
        K.CC.B.4
        
        K.CC.B.5
      - K.CC.C
        
        K.CC.C.6
        
        K.CC.C.7
    - Operations and Algebraic Thinking
      - K.OA.A
        
        K.OA.A.1
        
        K.OA.A.2
        
        K.OA.A.4
        
        K.OA.A.5
    - Number and Operations in Base Ten
      - K.NBT.A
        
        K.NBT.A.1
    - Measurement and Data
      - K.MD.A
        
        K.MD.A.1
        
        K.MD.A.2
      - K.MD.B
        
        K.MD.B.3
    - Geometry
      - K.G.A
        
        K.G.A.1
        
        K.G.A.2
        
        K.G.A.3
      - K.G.B
        
        K.G.B.4
        
        K.G.B.5
        
        K.G.B.6
  - Grade 1
    - Operations and Algebraic Thinking
      - 1.OA.A
        
        1.OA.A.1
        
        1.OA.A.2
      - 1.OA.B
        
        1.OA.B.3
        
        1.OA.B.4
      - 1.OA.C
        
        1.OA.C.5
        
        1.OA.C.6
      - 1.OA.D
        
        1.OA.D.8
    - Number and Operations in Base Ten
      - 1.NBT.A
        
        1.NBT.A.1
      - 1.NBT.B
        
        1.NBT.B.2
        
        1.NBT.B.3
      - 1.NBT.C
        
        1.NBT.C.4
        
        1.NBT.C.5
        
        1.NBT.C.6
    - Measurement and Data
      - 1.MD.A
        
        1.MD.A.1
        
        1.MD.A.2
      - 1.MD.B
        
        1.MD.B.3
      - 1.MD.C
        
        1.MD.C.4
    - Geometry
      - 1.G.A
        
        1.G.A.1
        
        1.G.A.2
        
        1.G.A.3
  - Grade 2
    - Operations and Algebraic Thinking
      - 2.OA.A
        
        2.OA.A.1
      - 2.OA.B
        
        2.OA.B.2
      - 2.OA.C
        
        2.OA.C.3
        
        2.OA.C.4
    - Number and Operations in Base Ten
      - 2.NBT.A
        
        2.NBT.A.1
        
        2.NBT.A.2
        
        2.NBT.A.3
        
        2.NBT.A.4
      - 2.NBT.B
        
        2.NBT.B.5
        
        2.NBT.B.6
        
        2.NBT.B.7
    - Measurement and Data
      - 2.MD.A
        
        2.MD.A.1
        
        2.MD.A.2
        
        2.MD.A.3
        
        2.MD.A.4
      - 2.MD.B
        
        2.MD.B.5
      - 2.MD.C
        
        2.MD.C.7
        
        2.MD.C.8
      - 2.MD.D
        
        2.MD.D.9
        
        2.MD.D.10
    - Geometry
      - 2.G.A
        
        2.G.A.1
        
        2.G.A.2
        
        2.G.A.3
  - Grade 3
    - Operations and Algebraic Thinking
      - 3.OA.A
        
        3.OA.A.3
        
        3.OA.A.4
      - 3.OA.B
        
        3.OA.B.5
        
        3.OA.B.6
      - 3.OA.C
        
        3.OA.C.7
      - 3.OA.D
        
        3.OA.D.8
        
        3.OA.D.9
    - Number and Operations in Base Ten
      - 3.NBT.A
        
        3.NBT.A.1
        
        3.NBT.A.2
    - Measurement and Data
      - 3.MD.A
        
        3.MD.A.1
        
        3.MD.A.2
      - 3.MD.B
        
        3.MD.B.3
        
        3.MD.B.4
      - 3.MD.C
        
        3.MD.C.5
        
        3.MD.C.6
      - 3.MD.D
        
        3.MD.D.8
    - Geometry
      - 3.G.A
        
        3.G.A.1
        
        3.G.A.2
    - Number and Operations-Fractions
      - 3.NF.A
        
        3.NF.A.1
        
        3.NF.A.2
        
        3.NF.A.3
New York State Standards
- Math
  - Preschool
- English Language Arts
  - Preschool
- Social Studies
  - Kindergarten
    - Individual Development and Cultural Identity
      - K.1
        
        K.1a
        
        K.1b
      - K.2
        
        K.2a
        
        K.2b
        
        K.2c
      - K.3
        
        K.3b
    - Civics
      - K.4
        
        K.4a
        
        K.4b
      - K.5
        
        K.5a
        
        K.5b
    - Geography and Environment
      - K.6
        
        K.6a
        
        K.6b
        
        K.6c
    - Time, Continuity, and Change
      - K.8
        
        K.8a
  - Grade 1
    - Individual Development and Cultural Identity
      - 1.3
        
        1.3a
        
        1.3b
        
        1.3c
      - 1.4
        
        1.4a
        
        1.4b
        
        1.4c
      - 1.1
      - 1.2
    - Geography and Environment
      - 1.5
        
        1.5a
        
        1.5b
        
        1.5c
      - 1.6
        
        1.6a
    - Time, Continuity, and Change
      - 1.7
        
        1.7d
      - 1.8
        
        1.8a
    - Economic Systems
      - 1.9
        
        1.9a
        
        1.9b
        
        1.9c
      - 1.10
        
        1.10a
        
        1.10b
  - Grade 2
    - Individual Development and Cultural Identity
      - 2.2
        
        2.2b
      - 2.1
    - Civics
      - 2.4
        
        2.4a
        
        2.4b
        
        2.4c
      - 2.3
    - Geography and Environment
      - 2.5
        
        2.5b
        
        2.5d
    - Time, Continuity, and Change
      - 2.6
      - 2.7
    - Economic Systems
      - 2.8
        
        2.8a
        
        2.8b
        
        2.8c
      - 2.9
        
        2.9a
        
        2.9b
        
        2.9c
  - Grade 3
    - Civics
      - 3.7
      - 3.8
    - Geography and Environment
      - 3.1
        
        3.1a
        
        3.1b
      - 3.2
        
        3.2a
        
        3.2b
      - 3.3
        
        3.3a
        
        3.3b
    - Time, Continuity, and Change
      - 3.4
        
        3.4a
        
        3.4b
    - Economic Systems
      - 3.9
        
        3.9a
      - 3.10
        
        3.10a
    - Cultures
      - 3.5
        
        3.5b
Next Generation Science Standards
- Science

Thinking Deeper about Addition and Subtraction—The Unknown Number

Using Unknown addend problems to help with Subtraction

Using Unknown addend problems to help with Subtraction

Using Unknown addend problems to help with Subtraction Part 2

Using Unknown addend problems to help with Subtraction Part 2

What’s the Rule - Part 1

What’s the Rule - Part 1

What’s the Rule - Part 2

What’s the Rule - Part 2

Figure out the Unknown Number

Figure out the Unknown Number

Unknown Number Word Problems

Unknown Number Word Problems