NC.2.NBT.7

Add and subtract, within 1,000, relating the strategy to a written method, using:

Concrete models or drawings
Strategies based on place value
Properties of operations
Relationship between addition and subtraction

Step 1: Lesson Standards & Learning Goals

Unpacking Clarification

This standard calls for students to extend their understanding of addition and subtraction to add and subtract two 3-digit numbers with concrete materials (manipulatives), models, drawings, place value strategies, and properties of operations to add within 1,000. Students should be introduced to these larger numbers with problems in the context of word problems since that helps students make sense of the problem (van de Walle et al., 2019).

*Since students have been working with Result Unknown problem types since kindergarten this is the problem type that should be the initial problem type used with this standard. Students are expected to explore all problem types with 3-digit addition and subtraction problems but should have access to concrete models or drawings during this work.

Sample Essential Questions

What are some strategies I can use to solve an addition and subtraction problem?
What are the properties that govern addition and subtraction?
What are models that can effectively demonstrate addition or subtraction?
How can the relationship between addition and subtraction help solve problems and check answers?
What are good explanations for describing why addition and subtractions strategies work?

Vocabulary

add
addends
compose
decompose
difference
equals
equation
place value
regroup
strategy
strategy
subtract
subtraction
sum
total

Students will be able to...

Add and subtract within 1,000, using concrete models or drawings and strategies based on place value, properties of operations and/or the relationship between addition and subtraction.
- - Model addition and subtraction problems using concrete objects such as base ten blocks.
  - Use properties of operations to solve addition and subtraction.
  - Use the relationship between addition and subtraction to solve problems
  - Compose and decompose numbers to add and subtract.
Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones.

Students will know...

There is a relationship between addition and subtraction.
When adding or subtracting three-digit numbers, hundreds are added or subtracted from hundreds, tens are added or subtracted from tens, ones are added or subtracted from ones.
When adding or subtracting, sometimes it is necessary to compose or decompose tens or hundreds.
All sums and differences can be found using base ten block models.
Sometimes numbers may need to be composed or decomposed in the process of adding or subtracting.
There are a variety of ways to add or subtract multi-digit numbers.

Step 2: Assessment

Mastery Connect

NC.2.NBT.7 - CO - Howell - Jan. 18, 2023
NC.2 - Cluster 5 Review - CO - Howell - Feb.17, 2023

Tools 4 NC Teachers

NCDPI Assessments

- Grade 2 Math Assessment Practice Prompts
  - Numbers & Operations in Base Ten

Step 3: Lesson Instructions

Possible Activating Strategies

Exploration or Experience

Anchor Chart

Read Aloud

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 B: Strategies for Composing a Ten
    - G2 M4 Topic C: Strategies for Decomposing a Ten
    - G2 M4 Topic D: Strategies for Composing Tens and Hundreds
    - G2 M4 Topic E: Strategies for Decomposing Tens and Hundreds
    - G2 M4 Topic F: Student Explanations of Written Methods
    - G2 M5 Topic A: Strategies for Adding and Subtracting within 1,000
    - G2 M5 Topic B: Strategies for Composing Tens and Hundreds within 1,000
    - G2 M5 Topic C: Strategies for Decomposing Tens and Hundreds within 1,000
    - G2 M5 Topic D: Student Explanations for Choice of Solution Methods
- Standards Alignment
- Zearn Math - Online Support Practice for Eureka Math (Requires free account)
North Carolina Collaborative for Mathematics Learning - Grade 2 Instructional Framework
NCDPI Resources
- Math Games Grade 2
- Grade 2 Math Assessment Practice Prompts
- Grade 2 Released Summative Assessments
Thinking Blocks - Word Problem Practice with Bar Diagrams

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