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) 

Lesson Idea (Common Core)Leprechaun Traps: Addition Within 100Grades K2 / Math / ReasoningMath.1.NBT.C.4 / Math.Practice.MP2 / Math.Practice.MP3
 155
 38

Lesson Idea (Common Core)Making Math Fun with Place Value GamesGrade 2 / Math / Place ValueMath.2.NBT.A.4 / Math.2.NBT.B.5 / Math.2.NBT.A.1a
 201
 95

Lesson Idea (Common Core)Skip Counting With Counting CollectionsGrades K2 / Math / StrategiesMath.2.NBT.A.1a / Math.2.NBT.A.2 / Math.Practice.MP5
 128
 25

Lesson Idea (Common Core)Sharing Strategies for Counting CollectionsGrades 23 / Math / Number SenseMath.2.NBT.A.2 / Math.3.NBT.A.2
 86
 23

Lesson Idea  Common CoreSubtraction as a Confidence BuilderGrades 35 / Math / Multiple MethodsMath.3.NBT.A.2
 10
 3

Lesson Idea (Common Core)Beyond Fingers: Place Value & the Numbers 1119Grades K2 / Math / ReasoningMath.K.NBT.A.1 / Math.Practice.MP2 / Math.Practice.MP3
 159
 63

Lesson Idea  Common CoreTalking About Math: Sharing StrategiesGrade 3 / Math / Student VoiceMath.3.NBT.A.2
 16
 7

Lesson Idea  Common CoreThird Grade Mental MathGrade 3 / Math / Number SenseMath.3.NBT.A.2
 131
 18
 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
 439 students
 Student/Teacher Ratio
 15:1
 District Spending
 $8208
Supporting Materials

Counting Collections to 100 Transcript
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Lesson Idea (Common Core) Counting Collections to 100
Grades K2 / Math / Addition