No Series: Counting Collections to 100
Math.1.NBT.C.4
 Common core State Standards
 Math: Math
 1: Grade 1
 NBT: Number & Operations in Base Ten
 C: Use place value understanding and properties of operations to add and subtract

4:
Add within 100, including adding a twodigit number and a onedigit number, and adding a twodigit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding twodigit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Math.1.NBT.C.5
Common core State Standards
 Math: Math
 1: Grade 1
 NBT: Number & Operations in Base Ten
 C: Use place value understanding and properties of operations to add and subtract

5:
Given a twodigit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
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Discussion and Supporting Materials
Thought starters
 How does the second part of the lesson build off of the first part?
 Ms. Tse says that she has a classroom of kids who love math. What can you learn from Ms. Tse about engaging students?
 How does Ms. Tse create opportunities for students to learn from each other?
School Details
Lakeridge Elementary School7400 South 115th St
Seattle WA 98178
Population: 417
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Theresa Tse
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56 MIN
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45 MIN
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