Georgia · Common Core · New Jersey · North Carolina
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Georgia's K-8 Mathematics Standards (2021) build subtraction fluency under Numerical Reasoning (NR) from counting strategies in Kindergarten through multi-digit algorithms by 4th–5th grade. Buzzer Beater Differences spans this full progression.
🟢 Kindergarten
K.NR.5.2
Represent subtraction with objects, fingers, drawings, and equations within 10. Result Unknown
K.NR.5.3
Use a variety of strategies to solve subtraction problems within 10, including counting backward and making 10. Result Unknown
🟡 First Grade
1.NR.2.1
Use a variety of strategies to solve subtraction problems within 20 in real-life contexts, with unknowns in all positions. All Modes
1.NR.2.5
Use the meaning of the equal sign to determine whether subtraction equations are true or false.
1.NR.2.6
Determine the unknown whole number in a subtraction equation relating three whole numbers (e.g., 5 = □ − 3, 10 − ? = 7). Change UnknownStart Unknown
🟠 Second & Third Grade
2.NR.2.2
Use place value understanding and properties of operations to subtract within 100 using strategies based on place value and the relationship between addition and subtraction.
2.NR.2.3
Fluently subtract within 20 using mental strategies. By end of Grade 2, know from memory all differences of two one-digit numbers.
3.NR.2.2
Use place value strategies and algorithms to subtract within 1,000, applying understanding of decomposing across place values.
🔴 Fourth & Fifth Grade
4.NR.2.2
Fluently subtract multi-digit whole numbers using the standard algorithm. Apply to solving real-world problems involving subtraction of large numbers.
5.NR.2.1
Solve real-world and mathematical problems requiring subtraction of multi-digit whole numbers and decimals to hundredths, using place value understanding and the standard algorithm.
Common Core State Standards for Mathematics (CCSS-M) develop subtraction fluency under Operations & Algebraic Thinking (OA) and Number & Operations in Base Ten (NBT) from Kindergarten through 5th grade, directly aligned to all three unknown-position modes in Buzzer Beater Differences.
🟢 Kindergarten
K.OA.A.1
Represent subtraction with objects, fingers, mental images, drawings, and equations.
K.OA.A.2
Solve subtraction word problems and subtract within 10 using objects or drawings. Result Unknown
K.OA.A.5
Fluently add and subtract within 5.
🟡 First Grade
1.OA.A.1
Use subtraction within 20 to solve word problems involving taking from, taking apart, and comparing, with unknowns in all positions. All Modes
1.OA.B.4
Understand subtraction as an unknown-addend problem (e.g., 10−8 by finding the number that makes 10 when added to 8). Change Unknown
1.OA.C.6
Subtract within 20, demonstrating fluency within 10, using strategies such as making ten, decomposing, and using the relationship between addition and subtraction.
1.OA.D.8
Determine the unknown whole number in a subtraction equation relating three whole numbers. Change UnknownStart Unknown
🟠 Second & Third Grade
2.OA.A.1
Use subtraction within 100 to solve one- and two-step word problems with unknowns in all positions. All Modes
2.NBT.B.5
Fluently subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction.
3.NBT.A.2
Fluently subtract within 1,000 using strategies and algorithms based on place value and properties of operations.
🔴 Fourth & Fifth Grade
4.NBT.B.4
Fluently subtract multi-digit whole numbers using the standard algorithm.
5.NBT.B.7
Subtract decimals to hundredths using concrete models or drawings and strategies based on place value and properties of operations.
New Jersey Student Learning Standards for Mathematics (NJSLS-M, 2023) follow the Common Core framework with added NJ-specific clarifications emphasizing real-world, identity-affirming contexts. All standards below directly support Buzzer Beater Differences across K–5.
🟢 Kindergarten
K.OA.A.2
Solve subtraction word problems and subtract within 10 using objects or drawings. NJ: include culturally relevant contexts. Result Unknown
K.OA.A.5
Fluently add and subtract within 5. NJ emphasis: build through meaningful, identity-affirming practice.
🟡 First Grade
1.OA.A.1
Use subtraction within 20 to solve word problems with unknowns in all positions. All Modes
1.OA.B.4
Understand subtraction as an unknown-addend problem. NJ note: connect concretely before moving to abstract equations. Change Unknown
1.OA.D.8
Determine the unknown whole number in a subtraction equation relating three whole numbers. Change UnknownStart Unknown
🟠 Second & Third Grade
2.OA.A.1
Use subtraction within 100 to solve one- and two-step word problems with unknowns in all positions. NJ emphasis: flexible, real-world contexts. All Modes
2.NBT.B.5
Fluently subtract within 100 using strategies based on place value and properties of operations. NJ emphasis: flexible strategies over rote procedures.
3.NBT.A.2
Fluently subtract within 1,000 using strategies and algorithms based on place value and properties of operations.
🔴 Fourth & Fifth Grade
4.NBT.B.4
Fluently subtract multi-digit whole numbers using the standard algorithm. NJ emphasis: apply to real-world contexts meaningful to students' lives.
5.NBT.B.7
Subtract decimals to hundredths using concrete models, drawings, and place value strategies. NJ note: connect to real-world money and measurement contexts.
North Carolina Standard Course of Study for Mathematics (NC SCOS, 2017) emphasizes concrete and representational strategies before abstract notation throughout K–5. The standards below are directly supported by Buzzer Beater Differences across all grade bands.
🟢 Kindergarten
K.OA.1
Represent subtraction within 10 with objects, fingers, mental images, drawings, and equations.
K.OA.2
Solve subtraction word problems within 10 using objects or drawings. NC: use separate/take-apart problem types. Result Unknown
K.OA.5
Demonstrate fluency for subtraction within 5. NC note: built through meaningful practice, not timed drills.
🟡 First Grade
1.OA.1
Use subtraction within 20 to solve word problems with unknowns in all positions. NC: students use □ or ? for unknowns. All Modes
1.OA.4
Understand subtraction as an unknown-addend problem within 20. Change Unknown
1.OA.8
Determine the unknown whole number in subtraction equations. NC: unknowns may be in any position. Change UnknownStart Unknown
🟠 Second & Third Grade
2.OA.1
Use subtraction within 100 to solve one- and two-step word problems with unknowns in all positions. All Modes
2.NBT.5
Fluently subtract within 100 using strategies based on place value and properties of operations.
3.NBT.2
Fluently subtract within 1,000 using strategies and algorithms based on place value. NC: students should understand why strategies work.
🔴 Fourth & Fifth Grade
4.NBT.4
Fluently subtract multi-digit whole numbers using the standard algorithm. NC emphasis: place value as the foundation.
5.NBT.7
Subtract decimals to hundredths using concrete models and strategies based on place value and properties of operations.
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