1. Make sense of problems and persevere in solving them.
 2. Reason abstractly and quantitatively.
 3. Construct viable arguments and critique the reasoning of others.
 4. Model with mathematics.
 5. Use appropriate tools strategically.
 6. Attend to precision.
 7. Look for and make use of structure.
 8. Look for- and express regularity in repeated reasoning.

• Chapter 1 - Adding & Subtracting to Twenty
  
   

  • Chapter 1 Vocabulary
    add
    plus (+)
    equals (=)
    addend
    sum
    addition sentence
    make 10
    doubles +1
    doubles -1
    subtract
    minus (-)
    difference
    subtraction sentence
    count up
    fact family
    missing addend
    part + part = whole
    whole - part = part
    addend + addend = sum
    doubles fact
     related addition facts
    related subtraction facts
    fact family

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  • Chapter 1 Concepts
    
    Addition Concepts
    Related Addition Facts
    Count On to Add
    Extend Facts to 20
    Make 10 to Add
    Doubles Facts
    Doubles +1; Doubles -1
    Three Addends
    Four Addends
    Subtraction Concepts
    Add or Subtract to Compare
    Count Back to Subtract
    Related Subtraction Facts
    Relate Addition and Subtraction
    Think Addition to Subtract
    Use Addition to Check
    Count Up to Subtract
    Make 10 to Subtract
    Writing a Number Sentence
    Fact Families
    Missing Addends
    Use a Bar Model
    Fact Patterns
    Problem Solving Strategy: Choose the Operation
    Problem Solving Strategy: Two-Step Problems
    Problem-Solving Applications: Mixed Strategies

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