NC.NBT.6
Add up to three two-digit numbers using strategies based on place value and properties of operations [within 100]
Embedded Files
Step 1: Lesson Standards & Learning Goals
This standard provides an opportunity for students to apply the commutative property and place value strategies (see table in 2.NBT.5) to find the sum of three 2-digit numbers. The commutative property of addition states that when the order of the addends is changed, the sum stays the same. Students are expected to explain why strategies work as they apply place value strategies by decomposing a two-digit number into tens and ones and then add the decomposed numbers. Students may use drawings or objects to support their explanation. *The US standard algorithm should not be taught until Grade 4. Students who have independently demonstrated proficiency with the strategies mentioned here should spend time working on adding and subtracting with expanded form which is the expectation in third grade.
Sample Essential Questions
Sample Essential Questions
What are some strategies I can use to solve an addition problem?
What is the commutative property of addition?
Explain why decomposing a number helps with addition.
Vocabulary
Vocabulary
add
addends
commutative property of addition
compose
decompose
digit
hundreds
ones
place value
sum
tens
Students will be able to...
Students will be able to...
Use multiple strategies, including concrete objects, drawings, and decomposing, to add up to three 2-digit numbers.
Apply place value strategies and the commutative property of addition to solve addition problems.
Add up to three 2-digit numbers using strategies based on place value and properties of operations.
Explain why a chosen strategy works for solving addition problems.
Students will know...
Students will know...
There are multiple strategies that can be used to solve addition problems with three 2-digit numbers.
Sometimes numbers may need to be composed or decomposed in the process of adding.
When adding numbers, the place and value of the digits is important for determining the sum.
Step 2: Assessment
Mastery Connect
Mastery Connect
NC.2.NBT.6 - CO - Howell - Jan. 18, 2023
NC.2 - Cluster 5 Review - CO - Howell - Feb.17, 2023
Tools 4 NC Teachers
Tools 4 NC Teachers
NCDPI Assessments
Grade 2 Math Assessment Practice Prompts
Step 3: Lesson Instructions
Possible Activating Strategies
Possible Activating Strategies
Anchor Chart
Video Clip
Exploration or Experience
Teacher Resources
Teacher Resources
Tools 4 NC Teachers
Cluster 6 Lessons
Math Expressions - (Barnes and Hearne) - Standards Alignment
Motivation Math
Think Up! Math
Khan Academy - 2nd Grade Math
Eureka Math/Engage NY Free Resources
Embarc Online (Eureka Math) -
G2 M4 Topic D: Strategies for Composing Tens and Hundreds
Zearn Math - Online Support Practice for Eureka Math (Requires free account)
North Carolina Collaborative for Mathematics Learning - Grade 2 Instructional Framework
NCDPI Resources
Grade 2 Math Assessment Practice Prompts
Grade 2 Released Summative Assessments
Thinking Blocks - Word Problem Practice with Bar Diagrams
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