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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 NEW!
 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?
 Common Core Standards
 Math.1.NBT.C.4, Math.1.NBT.C.5
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
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Lesson Idea (Common Core) Counting Collections to 100
Grades K2 / Math / Addition