Georgia 2.NR.2.4
The Standard
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Georgia's K-12 Mathematics Standards · Apply multiple part-whole strategies, properties of operations and place value understanding to solve real-life, mathematical problems involving addition and subtraction within 1,000.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add and subtract two-digit numbers accurately and efficiently. They use place value, operation properties, or inverse operations to explain and check their work.
What Mastery Looks Like
- Students choose an efficient strategy and solve accurately without counting every amount by ones. They explain how tens and ones were combined, broken apart, or regrouped, and can check with the inverse operation.
Common Misconceptions
- Students may add or subtract each digit separately and ignore regrouping. They may count by ones instead of using tens, or confuse which inverse operation checks their answer.
How to Assess It
- Exit ticket: Solve 47 + 38 and 82 − 46, show a place value strategy for each, then check one answer using the inverse operation.
Lesson moves
Ways to Teach It
Use base-ten blocks to model 46 + 37 and 83 − 46, trading ten ones for a ten or reversing the trade.
Ask students to compare compensation and regrouping for 58 + 27, then write which method feels clearer and why.
Play a partner card game where students draw two two-digit numbers, add or subtract them, and earn a point for an accurate explanation.
Give students a $100 classroom store list and ask them to find total costs and change using whole-dollar prices.
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Printable 2.NR.2.4 Worksheet
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Related Standards
- 4.NR.2.1
Fluently add and subtract multi-digit numbers to solve practical, mathematical problems using place value understanding, properties of operations, and relations...
- 2.NR.2.1
Fluently add and subtract within 20 using a variety of mental, part-whole strategies.
- 1.NR.2.4
Fluently add and subtract within 10 using a variety of strategies.
- 3.PAR.2.1
Fluently add and subtract within 1000 to solve problems.
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