NC.1.OA.2
Represent and solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, by using objects, drawings, and equations with a symbol for the unknown number.
Embedded Files
Step 1: Lesson Standards & Learning Goals
Students are expected to solve multi-step word problems by adding (joining) three numbers whose sum is less than or equal to 20, using a variety of strategies and mathematical representations that are described in NC.1.OA.1 and NC.1.OA.6.
Students may use concrete models or drawings to support their work on this standard before transitioning to using tools such as adding on a number line or number combinations (facts) to find the answers to these problems.
This standard provides rich opportunities for students to develop specific addition strategies as well as the commutative property of addition.
In Grade 1, one of the primary strategies is making a ten, so students should initially have ample opportunities to add three addends where two of the addends equal 10. Based on the commutative property of addition the addends can be arranged without changing the answer. When posing problems consider giving students problems where the first and third addend have a sum that is equal to 10. Examples include: 4 + 5 + 6, 2 + 3 + 8, and 3 + 4 + 7.
Sample Essential Questions
Sample Essential Questions
Vocabulary
Vocabulary
add
addend
addition
total
sum
Students will be able to...
Students will be able to...
Solve multistep word problems by adding three numbers whose sum is less than or equal to 20.
Use concrete models and drawings to support problem-solving.
Transition to number lines and number combinations.
Develop specific addition strategies as well as the commutative property of addition.
Students will know...
Students will know...
Three numbers can be added in any order and the sum will be the same.
Models can used to show
Step 2: Assessment
NCDPI Math Assessment Released Forms
Grade 1 Math Assessment Practice Prompts
Grade 1 Released Summative Assessments
Step 3: Lesson Instructions
Possible Activating Strategies
Possible Activating Strategies
Teacher Resources
Teacher Resources
Tools 4 NC Teachers
Cluster 4 Lessons
Math Expressions - (Barnes and Hearne) - Standards Alignment
Motivation Math
Think Up! Math
Khan Academy - 1st Grade Math
Eureka Math/Engage NY Free Resources
Embarc Online (Eureka Math)
Zearn Math - Online Support Practice for Eureka Math (Requires free account)
North Carolina Collaborative for Mathematics Learning - Grade 1 Instructional Framework
NCDPI Resources
Grade 1 Math Assessment Practice Prompts
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