Welcome to Mathnasium of South County

Friendliest staff that genuinely care about my son.


We really like the manager who is so professional and kind. My daughter is learning here.

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Summer Programs

Make Mathnasium Part of Your Summer Plans.

Make Mathnasium part of your Summer

Now is the time to get Mathnasium on your summer schedule. Summer at Mathnasium is a fun and engaging way for your child to keep up their math skills and prepare for the school year ahead: • Free assessment -> Individualized Learning Plan • Live, face-to-face instruction • A proven teaching method that results in true understanding and increased confidence.

Schedule Free Assessment

Contact us

South County

  • 38 Ronnie's Plaza
  • St. Louis, MO 63126
  • Call (314) 270-3891

Hours of Operation

Instructional Hours

Mon-Thurs 3:00PM - 7:00PM
Sun 1:00PM - 5:00PM

Office Hours

10:00AM - 3:00PM
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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:

  • Sappington Elementary School
  • Holy Cross Academy
  • Assumption Parish School
  • Thomas Jefferson School
  • Lindbergh High School
  • Home School Families

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

Hope is an ambitious and goal-driven individual currently studying Biochemical Engineering at the University of North Alabama. With a passion for fitness, community building, and problem-solving, she is eager to bring her diverse skill set to benefit the Mathnasium community. During her time at t(...)



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

Student of the Month - May

Jun 11, 2024 | South County

Teacher Appreciation

May 13, 2024 | South County

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"My son currently has an A+ in eighth-grade math. He went from good at math to great – and far more interested. The instructors here are fabulous! Everyone is so welcoming and it is a very comfortable learning environment. *Please use first name and last initial (vs name). Thank you."

— M.M.

South County

38 Ronnie's Plaza

St. Louis, MO 63126

United States