# 3. Three-digit addition and subtraction without regrouping (A)

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.7 http://corestandards.org/Math/Content/2/NBT/B/7
teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.9 http://corestandards.org/Math/Content/2/NBT/B/9
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Add and subtract three-digit numbers without regrouping.

This lesson provides an opportunity for students to apply their knowledge and understanding of three-digit addition and subtraction without regrouping to a mathematical situation. Students are asked to check the correctness of Brian's answers to a three-digit addition and subtraction problem by applying other strategies or tools.

Key Concept students will use: Addition and subtraction strategies used with two-digit numbers can be used with three-digit numbers (no regrouping).

Skills students will use:

• Add numbers within 1,000 using knowledge of place value and properties of operations
• Add numbers within 100 using knowledge of place value (Grade 2, Unit 1)
• Represent three-digit numbers in different but equivalent ways (Grade 2, Unit 6)

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they apply different strategies to solve three-digit addition and subtraction problems, including the use of multiple tools such as base ten blocks and number lines.

Key vocabulary:

• base ten blocks
• decompose
• digit
• hundreds
• number line
• ones
• place value
• tens

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