Counting Collections to 100
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. 
Download Common Core State Standards (PDF 1.2 MB) 
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. 
Download Common Core State Standards (PDF 1.2 MB) 

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 Lesson Objective
 Count and add within 100
 Length
 6 min
 Questions to Consider
 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?
Teacher & School Info

Theresa Tse
 School Details
 Lakeridge Elementary School Seattle, WA
 Population
 420 students
 District Spending
 $8,208
Supporting Materials

Counting Collections to 100 Transcript