Topic One: Solve Addition and Subtraction Problems To 10

Pacing (Duration of Unit): 9 Lessons

Desired Results

Transfer:
1. Makes 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.
Established Goals:

  • 1.OA.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Student "I Can" Statements:

  • I can use different strategies for addition to solve word problems (within 20).
  • I can use different strategies for subtraction to solve word problems (within 20).

Prerequisite Standards:

  • K.OA.1 Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g. claps), acting out situations, verbal explanations, expressions, or equations.
  • K.OA.2 Solve addition and subtraction word problems, and add and subtract within 10, e.g., by using objects or drawings to represent the problem.
  • K.OA.3 Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
  • K.OA.5 Fluently add and subtract within 5.
Big Ideas:

  • Operation Meanings & Relationships
    There are multiple interpretations of addition, subtraction, multiplication, and division of rational numbers and each operation is related to other operations.
  • Practices, Processes, and Proficiencies
    Mathematics content and practices can be applied to solve problems.
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Essential Questions:

  • What are ways to think about addition and subtraction?
Students will know...

  • Adding to is one interpretation of addition. Addition equations can be used to show add to addition situations.
  • Putting two parts together to make a whole is one interpretation of addition. Addition equations can be used to show situations in which two parts are put together.
  • Decomposing numbers can be used to solve addition word problems in which the total is known, but the parts are unknown. Addition equations can be used to show addition situations where both parts are unknown.
  • Taking away one part from a whole is one interpretation of subtraction. Subtraction equations can be used to show subtraction situations in which one part if taken from the whole.
  • Comparing two groups to find how many more objects are in one group than another group is one interpretation of subtraction. Subtraction equations can be used to show situations in which two quantities are compared.
  • Comparing two groups to find how many fewer objects are in one group than another group is one interpretation of subtraction. Subtraction equations in which two groups are compared.
  • Adding to is one interpretation of addition. Addition equations can be used to show add to addition situations.
  • Finding a missing part of a whole is an interpretation of both addition and subtraction. Addition or subtraction equations can be used to show situations involving a missing part.
  • Mathemeticians use math to explain why they are right. They can talk about math that other do, too.


Vocabulary:
Add, sum, plus, equals, equation, parts, whole, difference, subtract, minus, fewer, addend
Students will be skilled at...

  • solving addition problems involving situations of adding one part to another part.
  • solving addition problems involving situations of putting two parts together.
  • solving addition word problems by breaking apart a total number of objects.
  • solving subtraction problems involving taking from a group.
  • solving subtraction problems that involve comparing to find out how many more objects are in one group than another group.
  • solving subtraction problems that involve comparing to fins out how many fewer objects are in one group than another group.
  • solving addition problems by finding a missing addend.
  • solving problems involving putting together or taking apart.
  • constructing math arguments in order to solve addition and subtraction problems.

Assessment Evidence

Performance Assessment:
Other Evidence:

Formative Assessments:

Learning Plan

Learning Activities:

1-1 Adding to is one interpretation of addition. Addition equations can be used to show add to addition situations.

1-2 Putting two parts together to make a whole is one interpretation of addition. Addition equations can be used to show situations in which two parts are put together.

1-3 Decomposing numbers can be used to solve addition word problems in which the total is known, but the parts are unknown. Addition equations can be used to show addition situations where both parts are unknown.

1-4 Taking away one part from a whole is one interpretation of subtraction. Subtraction equations can be used to show subtraction situations in which one part if taken from the whole.

1-5 Comparing two groups to find how many more objects are in one group than another group is one interpretation of subtraction. Subtraction equations can be used to show situations in which two quantities are compared.

1-6 Comparing two groups to find how many fewer objects are in one group than another group is one interpretation of subtraction. Subtraction equations in which two groups are compared.

1-7 Adding to is one interpretation of addition. Addition equations can be used to show add to addition situations.

1-8 Finding a missing part of a whole is an interpretation of both addition and subtraction. Addition or subtraction equations can be used to show situations involving a missing part.

1-9 Good math thinkers use math to explain why they are right. They can talk about math that other do, too.
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