Unit 9

Putting It All Together

Unit Goals

Unit Narrative

In this unit, students revisit major work and fluency goals of the grade, applying their learning from the year.

The first section gives students a chance to solidify their fluency with addition and subtraction within 20. The second section, students apply methods they used with smaller numbers to add and subtract numbers within 100. Students also revisit numbers within 1,000: composing and decomposing three-digit numbers in different ways and using methods based on place value to find their sums and differences.

In the final section, students interpret, solve, and write...

Section A

Section Goals

Section Narrative

In this section, students practice adding and subtracting within 20 to meet the fluency expectations of the grade, which include finding all sums and differences within 20, and knowing from memory all sums of 2 one-digit numbers.

Students begin with exercises and games that emphasize using the relationship between addition and subtraction to find the value of expressions and unknown...

Let’s find the value of sums and differences mentally.

Let’s add and subtract fluently.

Let’s add and subtract length measurements.

Let’s create line plots and add and subtract measurements of length.

to access Section Checkpoints.

Section A

Let’s find the value of sums and differences mentally.

Let’s add and subtract fluently.

Let’s add and subtract length measurements.

Let’s create line plots and add and subtract measurements of length.

Section B

Section Goals

Section Narrative

In this section, students revisit numbers within 1,000 and develop their facility with addition and subtraction within 100. The work here requires students to compose and decompose multiple place-value units, which reinforces their understanding of place value and operations on larger numbers.

Students begin by decomposing and composing three-digit numbers in multiple ways using base-ten blocks, base-ten diagrams, words, and...

Let’s represent numbers in many different ways.

Let’s compose and decompose numbers to make expressions with the same value.

Let’s add and subtract within 1,000.

Let’s fluently add and subtract within 100.

to access Section Checkpoints.

Section B

Let’s represent numbers in many different ways.

Let’s compose and decompose numbers to make expressions with the same value.

Let’s add and subtract within 1,000.

Let’s fluently add and subtract within 100.

Section C

Section Goals

Section Narrative

In this section, students create and solve one- and two-step story problems with unknown values in all positions. They discuss how they make sense of the problem and share their methods for solving.

By now, students are expected to solve all types of story problems within 100, using methods and representations that make sense to them. They continue to make...

Let’s analyze story problems.

Let’s determine the question in story problems.

Let’s match diagrams, story problems, and equations.

Let’s write story problems.

Let’s solve, represent, and share story problems.

to access Section Checkpoints.

Section C

Let’s analyze story problems.

Let’s determine the question in story problems.

Let’s match diagrams, story problems, and equations.

Let’s write story problems.

Let’s solve, represent, and share story problems.

to access End-of-Unit Assessments.

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Putting It All Together

Unit Goals

Unit Narrative

Section Goals

Section Narrative

Section Goals

Section Narrative

Section Goals

Section Narrative

Unit 9 Resources

About Unit 9

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