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* *Reflection: Diverse Entry Points
The Video Game Model of Adding - Section 2: Guided Practice

When adding on from 1,100 to get to 2000, using increments of 100, this child creates the equation 1,100 + 3 (3x100) = 2000. A simple visual enabled him to make that leap, which was an unintended consequence of the lesson.

*Diverse Entry Points: Simple Tools Help Them Make Tremendous Leaps*

# The Video Game Model of Adding

Lesson 11 of 11

## Objective: SWBAT create and verbally explain and demonstrate, with models and equations, multiple ways to add on from a given number to 2000 using repeated addition of 50 and 100 and multiplication of 50 and 100.

#### Opener

*3 min*

This lesson is based on the reward structure in a popular video game called Plants versus Zombies. While almost all of my 3rd graders play it, I have not linked to information about the game because it's rated for 10 years old and above.

Your students most likely will recognize what this lesson is patterned after, but I do not want to suggest you use an inappropriate resource in your lesson. If you are unfamiliar with this game, and would like to see the model I've providing a link to a subcomponent of the original version of the game. As this is not recommended for the age group of our students, I am not endorsing watching this video clip in class.

The intention of this lesson is twofold. First, in my classroom there is often a correlation between reluctant students and video game use. Therefore, I have found the use of video games, even very briefly to be an effective tool to get these children "on board". So I am using this as an engagement tool.

Secondly, whether students are gamers or not, the format of online games such as this provide a useful, familiar structure through which students can gain further hands-on and written experience with repeated addition and multiplication patterns.

As the lesson opener, I simply ask the students who is familiar with the game and then ask them to “30 second think” (silent) about what they know about how points are awarded in the game. If they are unfamiliar with the game, I ask them to think about video games with which they are familiar and apply the same question. Occasionally, I will have a student who does not play video games. I ask them to think about how they would award points if they were running a simple carnival game such as a bean bag toss.

After the “30 second think” I have them share their thoughts with an immediate neighbor for 1-2 minutes.

Then I explain that we are going to use an imaginary video game modeled after a simple, popular game to help us practice repeated addition and multiplication. (The repeated addition should quickly be replaced by the multiplication, but I leave it in as a scaffold for any students who need the reassurance of the familiar and/or extra support).

Then I show the PowerPoint which immediately begins to address this task. It narrates itself.

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#### Guided Practice

*22 min*

Go through these simulated video game examples of adding on 50 and 100. Encourage the students to work through the examples with you and attempt them on their own when they are ready.

The idea of representing an unknown factor or addend with *n* instead of a ? is presented in the lesson. If your students are not yet familiar with this concept, explain to them that *n* or any letter can be used to represent an unknown quantity, and that this is the way that unknown variables are represented in higher level math.

I prefer to do this part of the lesson on whiteboards or scrap paper to discourage the students from becoming too absorbed in formatting the problems correctly. The emphasis here is on the thinking.

#### Resources

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#### Independent Practice

*33 min*

Students work independently or in partnerships to solve problems similar to those in the guided practice.

Provide the 50 star and 100 star cards so that they can create models to help solve the equations (MP4, MP7). This is the type of activity in which it can be very helpful to take anecdotal notes. The box on my anecdotal notes that says "score" can apply to system you use - it might be a letter grade you would give that particular problem, it could be a rubric grade, it could be a star, check plus, check, check minus... anything that helps you retain a picture of what the child said and did that indicated their level of understanding of the process of adding on and multiplying with the amounts of 100 and 50).

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#### Wrap-up

*4 min*

To close, ask the students to share a strategy they use for adding on 50 or 100 or for using a combination equation that includes multiplication. Students can then report out on their own ideas or those of a partner, time permitting. The rigor of the activity is derived from the contextualizing of their learning, so it is critical that you do not leave out this closing step.

Support students in explaining their thinking by inviting them to use concrete representations (e.g., drawings, manipulatives, number line). Third grade students are developing language and communication skills, so the goal is to create successful situations. Using concrete materials provides students with a starting point, because they can use them to describe and/or recreate.

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- UNIT 1: 1st Week: Getting to Know Each Other Through Graphs
- UNIT 2: Addition and Subtraction
- UNIT 3: Multiplication
- UNIT 4: Introduction to Basic Division
- UNIT 5: Division in Context
- UNIT 6: Time
- UNIT 7: Rounding
- UNIT 8: Place Value Practice
- UNIT 9: Fractions
- UNIT 10: Math and Me: Nutrition, Health and More
- UNIT 11: Geometry in Architecture
- UNIT 12: Time Cycle 2
- UNIT 13: Patterns in Math
- UNIT 14: Area and Perimeter
- UNIT 15: Solving Mult-Step Word Problems Using the Four Operations
- UNIT 16: Musical Fractions
- UNIT 17: Volcanoes (Data Collection, Graphs, Addition & Subtraction)

- LESSON 1: Tubing Tens - Cool Off with an Imaginary River Adventure
- LESSON 2: Tubing Tens - Create a Story
- LESSON 3: African Amphibians - Review Multiplying by Ones & Twos While Learning Fun Facts About Frogs
- LESSON 4: Open Number Lines - Just the Basics
- LESSON 5: Open Number Line - Decomposed Factors
- LESSON 6: Swimming Swamp Monkeys - Using an Open Number Line to Solve Word Problems
- LESSON 7: Commutative - Concrete Representations
- LESSON 8: Fun with Four: Decomposing to Known Factors of 1, 2, and 5
- LESSON 9: Counting Clams - A Tidal Flat Adventure
- LESSON 10: Monster Math
- LESSON 11: The Video Game Model of Adding