Georgia 1.NR.2.7
The Standard
Apply properties of operations as strategies to solve addition and subtraction problem situations within 20.
Georgia's K-12 Mathematics Standards · Explain the relationship between addition and subtraction and apply the properties of operations to solve real-life addition and subtraction problems within 20.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students choose useful ways to solve addition and subtraction situations within 20. They rearrange or break apart numbers, make ten, and use related addition facts to subtract.
What Mastery Looks Like
- Students solve story problems within 20 using strategies such as making ten, switching addends, or breaking apart numbers. They show their thinking with objects, drawings, or equations and explain why the strategy works.
Common Misconceptions
- Students may think numbers can be switched in subtraction because they can be switched in addition. They may also break apart an addend but forget to include every part.
How to Assess It
- Give this exit ticket: “Mia has 8 red counters and 7 blue counters. Find the total by making ten, then write a related subtraction fact.”
Lesson moves
Ways to Teach It
Have students build 8 + 7 with counters and ten-frames, then move counters to make a full ten.
Ask students to explain in writing why 6 + 9 and 9 + 6 have the same total.
Play a partner card game where students draw two number cards, add them, and name a helpful strategy.
Set up a classroom supply problem where students combine or remove pencils, then record two related equations.
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Printable 1.NR.2.7 Worksheet
A ready-to-print activity worksheet aligned to 1.NR.2.7, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 1.NR.2.1
Use a variety of strategies to solve addition and subtraction problems within 20.
- 1.NR.2.2
Use pictures, drawings, and equations to develop strategies for addition and subtraction within 20 by exploring strings of related problems.
- K.NR.5.3
Use a variety of strategies to solve addition and subtraction problems within 10.
- 1.NR.2
Explain the relationship between addition and subtraction and apply the properties of operations to solve real-life addition and subtraction problems within 20.
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