Sonoran Desert Scenarios: Addition and Subtraction Word Problems

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Objective

SWBAT read and write number words. SWBAT solve addition and subtraction word problems by identifying necessary information.

Big Idea

Numbers in context make more sense than they do in isolation.

Lesson Author

Jennifer Valentine

Tucson, AZ

Grade Level

Third grade

Subjects

Math

Social Studies

Number Sense and Operations

Standards

3.OA.D.8

Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.

MP1

Make sense of problems and persevere in solving them.

MP2

Reason abstractly and quantitatively.

Mini Lesson

10 minutes

Students come to the carpet with their whiteboards and markers and we review reading and writing number words: Number Word Mini Lesson.

Active Engagement

50 minutes

Differentiation Within One Activity

The first part of this practice is a review of (mini informal formative) number words. Students may work with a partner on this. I monitor them to see if there is a child in a partnership that doesn't understand and I record that information in my anecdotal notes.

Then, students work with a partner and read and analyze the word problems, looking for the pertinent information and setting up the addition and subtraction problem. I walk around to prompt them to talk about what they are doing in complete sentences.

Student study page: Word Problems Number Words AZ Sonora MX

Examples of student errors and my analysis: Student Work Examples

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