# Guest Post: Solving Absolute Value Equations with a Little Creativity

Good morning!  Today, I’m happy to share a guest post with you from Beaura Cavalier. She is a high school math teacher in Arkansas, and I am so excited to share with you what she has to say about teaching students to solve absolute value equations with a little creativity.  I’ll let her take it away!

I was trying to find a way to help my Algebra 1 students remember how to do Absolute Value Equations. During a class, I came up with the following analogy.

Okay, so here is the problem.

The prisoners (3x – 1) are in jail (absolute value bars).

They want to get out of jail, but first they have to wait until their visitors (any number outside of the absolute value bars) leave. So, add, subtract, multiply, or divide (on both sides of the equation) to get their visitors to leave.

Now that you have the prisoners all by themselves (in their jail cell) on one side of the equal sign, they prisoners can get parole!

Once they are released from jail, they have two options. They can choose to be good (equal to the positive of whatever is on the other side of the equal sign) or they can choose to be bad (equal to the negative of what is on the other side of the equal sign).

Then solve both equations to get two values for x.

The students laughed at my ideas, but now they are quick to point out that the prisoners have the choice of being bad or good, so x has two values!

Thank you so much Beaura for sharing a bit of your classroom with us!  My leveled practice cards for solving absolute value equations would be the perfect practice opportunity to go along with this lesson.

## More Activities for Teaching Absolute Value Equations and Inequalities

Allison Schultz

Friday 21st of January 2022

Love this! I have a similar jail story that I use when simplifying radicals! Thanks for the inspiration!

Steven

Sunday 20th of November 2016

I have a comparable one I've used for middle-schoolers since a class first sniggered: when things cuddle up, they multiply.

Sarah Carter (@mathequalslove)

Sunday 20th of November 2016

Oh my goodness. I haven't heard this one!

Carly

Sunday 20th of November 2016

I use that too! And then I tell them that the product is their 'maths baby'. So many groans, so much remembering.

Aaron Bieniek

Friday 18th of November 2016

Aaron Bieniek

Thursday 23rd of February 2017

@Beaura I would write a similar reply regarding teacher use of PEMDAS. I would point readers to the article "Questioning the Order of Operations" in Mathematics Teaching In The Middle School, October 2016. MTMS has additional articles on this topic from March of 2011, December of 2002. Teaching Children Mathematics has articles from February 2012 and August 2015 specifically on PEMDAS and more generally on forgoing rule, memory driven mathematics instruction. I'd be happy to provide PDF's of these articles (just don't tell NCTM).

We need to get away from the idea that math is about rules and remembering stuff. It isn't. It's about structures and strategies and flexible thinking. In what ways can our instruction engender flexible strategic thinking rather than an adherence to rules, mnemonics, and organizational tools?

Beaura Cavalier

Friday 16th of December 2016

Aaron, For many of my students, mathematical thinking is a struggle. Just as math teachers use "Please Excuse My Dear Aunt Sally" to help students remember the Order of Operations, my prisoner description is just a memory tool to help them remember the order of the steps to solve absolute value equations.

Leeanne Branham

Monday 28th of November 2016

Exactly my thought Aaron.

Sarah Carter (@mathequalslove)

Friday 25th of November 2016

Thank you for some food for thought!

Anonymous

Friday 18th of November 2016

LOVE this! Big props to you, Beaura! I am going to use it next month when we get to abs value functions. Thank you! -snapdragon

Sarah Carter (@mathequalslove)

Friday 25th of November 2016

Glad you found it useful!