Welcome to mathnasium of Portsmouth

My son absolutely loves going to Mathnasium! Who knew? He just started kindergarten and we thought it would be...

Kristen Martin

Salvador's math teacher is the best! We could not be happier with Sal's progress and his teacher is the reason...

matt zodrow

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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By submitting this form 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. By submitting this form you also consent to Mathnasium's Terms of Use and Privacy Policy.

"Great experience have been going for years. I feel like it is really helping my daughter!!!"

— S.B.


14 Potomac Road

Portsmouth, RI 02871

United States

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