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# Checking Your Models and Delta Math of Your Choice

Lesson 3 of 13

## Objective: SWBAT choose what they want to practice and develop mastery of the learning targets of their choice.

Today's class is in the computer lab. As students arrive I tell them that it's a work period, and that there are Delta Math assignments available for five different Student Learning Targets. Anyone who wants to can get started on the Delta Math right away.

"There's one thing you might want to see first," I say, "especially if you need a little help finishing the Interpretation Questions for the Class of 2017 Fundraiser." I'm referring to yesterday's work, in which students had to write a linear function and quadratic function to model a fundraising situation.

I provide links to two graphs on Delta Math. Watch this video to see how students use these graphs. Here is a link to the first graph, which plots y=n(x), and here is a link to the second, which plots y=R(x).

I give students as much time as they'd like to play with the graphs, to manipulate and see how close they can get. If they're totally frustrated, I'll reveal the solutions, but usually I don't have to do that. Some students ignore these graphs completely and just straight into a Delta Math assignment, and that's fine too.

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For most of today's class (and one day in each of the next two weeks), students will work on the assignment of their choice on Delta Math. I created these assignments based on the work requests I've received from students (see the first lesson of this unit for a description of work requests).

For today, there are assignments for five Student Learning Targets:

- 1.3: I can interpret expressions that represent a quantity in terms of its context.
- 1.4: I can create equations and inequalities in one variable and use them to solve problems.
- 2.2: I can compare two or more different data sets by using shape, center, and spread.
- 5.3: I can use algebraic substitution to solve a system of equations.
- 6.3: I can complete the square in a quadratic expression to reveal the maximum or minimum value of the function it defines.

Check out this narrative video for an overview of what these assignments looks like and how I use them. If you've never used Delta Math before, I recommend taking a look. It's not the only tool of its kind, but it's simple, to the point, and it was created by a high school math teacher who wanted to make his job easier. He's still in the classroom. I share a brief suggestion for how to get started exploring the site in this video.

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- UNIT 1: Number Tricks, Patterns, and Abstractions
- UNIT 2: The Number Line Project
- UNIT 3: Solving Linear Equations
- UNIT 4: Creating Linear Equations
- UNIT 5: Statistics
- UNIT 6: Mini Unit: Patterns, Programs, and Math Without Words
- UNIT 7: Lines
- UNIT 8: Linear and Exponential Functions
- UNIT 9: Systems of Equations
- UNIT 10: Quadratic Functions
- UNIT 11: Functions and Modeling

- LESSON 1: What Should I Charge?
- LESSON 2: Class of 2017 Fundraiser: Modeling and Interpretation
- LESSON 3: Checking Your Models and Delta Math of Your Choice
- LESSON 4: Work Period: Review Work & New Work
- LESSON 5: Review and Work Periods
- LESSON 6: The Locker Problem
- LESSON 7: Computer Lab Day: More Practice
- LESSON 8: Mixture Problems
- LESSON 9: Three Review and Work Periods
- LESSON 10: Class Exit Survey and This Is How You Study!
- LESSON 11: Group Problem Solving, Session 2
- LESSON 12: The Last Day of Class
- LESSON 13: Final Exam