Welcome to Mathnasium of O'Fallon

The instructors are very effective at teaching math in a way my teenager can comprehend. The instructors are ...


We had a great experience with Mathnasium, we can’t wait to come back.

Baljinder Kaur
mobile version of sandcastle image

Summer Programs

Make Mathnasium Part of Your Summer Plans.

No-Risk Assessment

Let's do an assessment and there is no up-front cost and no obligation. This is a great chance to determine your child's math skill and see how your program can help.

Contact Us

Contact us


  • 210 Hartman Lane #100
  • O'Fallon, IL 62269
  • Call (618) 624-6402

Hours of Operation

Instructional Hours

Mon - Thu 3:00PM - 7:30PM
Fri 3:00PM - 5:30PM
Sun 2:15PM - 5:00PM

Office Hours

Mon - Fri
11:00AM - 7:00PM
View All Hours arrow

arrow Alert!

Mathnasium of O'Fallon is closed today, 2/16/24, due to weather.

Already enrolled?

Log in

Hello. I'm Greg Marston, Center Director of Mathnasium of O'Fallon, your neighborhood math-only learning center. We help kids in grades 1-12 understand math by teaching the way that makes sense to them.

We specialize in math-only instruction with a focused, caring, and fun learning approach that delivers results.
We proudly serve local communities and schools, including:

  • O'Fallon
  • Shiloh
  • Fairview Heights
  • Belleville
  • Collinsville
  • Mascoutah

Dedicated to providing the best instruction

Our instructors are enthusiastic about math and specially trained in the Mathnasium Method. They create a caring and encouraging environment where your child will learn and thrive!

Meet the Team gallery1

Instructor Spotlight

Christian Burton
Christian is a student at Truman State University majoring in Mathematics with a goal of becoming a high school Math teacher. He loves helping others and has taught Math, Chess, and Karate! In his free time he enjoys traveling, trying new food, and cooking new recipes. Both of his parents are artist(...)



One-on-One Assessment

Our unique assessment pinpoints what each child already knows and what they still need to learn.


Customized Learning Plan & Goals

Our detailed plan takes your child step-by-step from where they are to where they need to go.


The Mathnasium Method™

Our proprietary curriculum and teaching method fosters skills that take hold and build upon one another.

Latest News & Posts

Are you a Parent Frustrated with Common Core Math Standards?

Sep 13, 2017 | O'Fallon

You aren’t alone. Lately, many parents in O’Fallon have been scratching their head in confusion as they looked at their child’s math work.  Common core standards are shifting math education. Parents are frustrated by not understandi..

Fix "Broken" Math Tools

Aug 8, 2017 | O'Fallon

Fix “Broken” Math Tools Have you ever used a broken or ineffective tool? The tool can be anything from a dull knife, a phone, or a remote needing new batteries. I bet you got frustrated every time you used the tool. Maybe you didn’t g..

Find out how Mathnasium will work for your child

Answer a few questions to learn more

My child is...


Have questions? Contact us.

By clicking "Submit," you agree to receive recurring advertising emails, text messages and calls from Mathnasium and its independently owned learning centers about our offerings to the phone number/email provided above, including calls and texts placed using an automatic telephone dialing system. Consent to receive advertising text messages and calls is not required to purchase goods or services. Message frequency varies. Message and data rates may apply. Reply STOP to no longer receive messages. Email [email protected] for assistance. By clicking "Submit," you also consent to Mathnasium's Terms and Conditions of Use and Privacy Policy.

"The instructors are very effective at teaching math in a way my teenager can comprehend. The instructors are also very patient and kind. "

— A.E.


210 Hartman Lane #100

O'Fallon, IL 62269

United States