NC.1.oa.6
Add and subtract within 20 using strategies such as:
counting on
making ten
decomposing a number leading to a ten
using the relationship between addition and subtraction
using a number line
creating equivalent but simpler or known sums
Embedded Files
Step 1: Lesson Standards & Learning Goals
In this standard, students are expected to develop increasingly sophisticated strategies to become more efficient with addition and subtraction within 20. Students are expected to demonstrate fluency (accuracy, efficiency, and flexibility) with number combinations (facts) within 10. With number combinations within 20 students should demonstrate these strategies by the end of the year while solving addition and subtraction problems. Most of the problems in first grade should be in the form of word problems, which provide rich opportunities for students to make sense of the action in mathematics problems and the various situations expected by the end of the year with NC.1.OA.1. In addition to choosing strategies, students are expected to explain their thinking and how they used the strategy that they chose.
*See Unpacking Document for examples of each strategy.
Sample Essential Questions
Sample Essential Questions
What strategies can be used to add and subtract numbers within 20?
Explain which strategy was used to solve the word problem and why it was chosen.
How do you add or subtract within 20 to solve story problems?
How do you use strategies to become fluent when adding or subtracting within 20?
Vocabulary
Vocabulary
addend
addition
count on
decompose
difference
equals
make a ten
number line
related facts
subtractions
sum
Students will be able to...
Students will be able to...
Add and subtract within 20.
Use a variety of strategies to extend their understanding of addition and subtraction within 20.
Explain the strategy used to solve addition and subtraction problems within 20.
Students will know...
Students will know...
There are many strategies you can use when adding and subtracting within 20.
The number 10 can be composed or decomposed to simplify addition and subtraction.
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
https://twitter.com/MrsDinh1/status/1057442535109468160
Teacher Resources
Teacher Resources
Tools 4 NC Teachers
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)
G1 M1 Topic A: Embedded Numbers and Decompositions
G1 M1 Topic B: Counting on from Embedded Numbers
G1 M1 Topic C: Addition Word Problems
G1 M1 Topic F: Development of Addition Fluency within 10
G1 M1 Topic I: Decomposition Strategies for Subtraction
G1 M1 Topic F: Development of Subtraction Fluency within 10
G1 M2 Topic A: Counting On or Making Ten to Solve Result Unknown and Total Unknown Problems
G1 M2 Topic B: Counting On or Taking From Ten to Solve Result Unknown and Total Unknown Problems
G1 M2 Topic C: Strategies for Solving Change or Addend Unknown Problems
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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