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
 529
 61

Tch SpecialAddition Number Talk: First GradeGrade 1 / Math / Tch DIYMath.1.NBT.C.4

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
 555
 127

Lesson Idea (Common Core)Skip Counting With Counting CollectionsGrades K2 / Math / StrategiesMath.2.NBT.A.1a / Math.2.NBT.A.2 / Math.Practice.MP5
 471
 36

Tch SpecialWhich One Doesn’t Belong: First GradeGrade 1 / Math / Tch DIYMath.1.NBT.B.2a / Math.1.NBT.B.2b

Lesson Idea (Common Core)Sharing Strategies for Counting CollectionsGrades 23 / Math / Number SenseMath.2.NBT.A.2 / Math.3.NBT.A.2
 291
 26

Lesson Idea (Common Core)Discover Number Patterns With Skip CountingGrade 3 / Math / Number SenseMath.3.OA.D.9 / Math.Practice.MP3 / Math.Practice.MP7
 149
 21

Tch SpecialDot Image Math Routine: Fourth GradeGrade 4 / Math / Tch DIYMath.4.NF.B.4a / Math.4.NF.B.4b
 32
 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