Welcome to Mathnasium of Portsmouth

Emily was fantastic, it was easy to learn from her and Ryan was awsome as well; He does so many fun learning t...

Joan Freeborn

Mathnasium has been great for our family. They have helped both of my boys for over 3 years. Mathnasium gave...


Contact us


  • 14 Potomac Road
  • Portsmouth, RI 02871
  • Call (401) 683-6284

Hours of Operation

Instructional Hours

Mon 3:00PM - 7:00PM
Tue 9:00AM - 12:00PM
Wed 3:00PM - 7:00PM
Thu 3:00PM - 7:00PM
Sat 10:00AM - 1:00PM
Sun 12:00PM - 4:00PM

Office Hours

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Hello. I'm Ryan Costa, Owner / Center Director of Mathnasium of Portsmouth, your neighborhood math-only learning center. We help kids in grades 2-12 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:

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

Ryan Costa
I have been tutoring and teaching math for 16 years. I specialize in math so that I can bring the highest quality instruction to the table. One of my best attributes is being able to quickly assess a student’s level of understanding, and being able to build from there. Math is a bottom-up subject, a(...)



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

Learn More About Us Today!

Dec 15, 2016 | Portsmouth

Located at 14 Potomac Road in Portsmouth RI, Mathnasium provides tutoring for students in grades 2-12 looking for support or enrichment with their math skills. We offer tutoring in the areas of Elementary Mathematics, Pre-Algebra, Algebra, Geometry, Pre-C..

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"My son’s math grades have gotten better. Thanks! "

— Jennifer St. Pierre


14 Potomac Road

Portsmouth, RI 02871

United States