# Counting Collections to 100

CCSS: Math.1.NBT.C.4 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 4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit 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 two-digit 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 two-digit 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 Objective
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?