C. A. II
Mina has went from 16th percentile in math to 95 percentile since starting Mathnasium! It's been an Amazing im...
See more reviews hereOur Results
94%
Math Skills
of parents report an improvement in their child’s math skills and understanding.
93%
Attitude
of parents report improved attitude toward math after attending Mathnasium.
90%
Success
of students saw an improvement in their school grades.
Our Results
The Proof Is In The Numbers
Math Skills
of parents report an improvement in their child’s math skills and understanding.
Attitude
of parents report improved attitude toward math after attending Mathnasium.
Success
of students saw an improvement in their school grades.
Mathnasium’s specially trained tutors in Franklin, WI, use the Mathnasium Method™, our proprietary teaching approach that combines personalized learning plans with proven teaching techniques to develop solid foundations for math mastery.
We build upon what the student already knows, addressing their unique learning needs and increasing knowledge level by level.
Our caring, specially trained math tutors provide face-to-face instruction in a supportive and engaging learning environment. We work with students of all skill levels to help them achieve math mastery.
Watch the video to discover how Mathnasium tutors helped Malachi become more confident in math.
Each Mathnasium student receives a personalized learning plan that considers their current skill level, knowledge gaps, and academic goals. Combined with our teaching approach, the plan is designed to help the student truly understand, master, and enjoy math.
Discover how Mathnasium helped Maddie transform her math skills. Initially struggling with the lowest math grades in her class, Maddie worked with our tutors using a personalized approach tailored to her specific needs.
Math Tutors Near You
We specialize in math-only instruction with a focused, caring, and fun learning approach that delivers results. We proudly serve the communities and schools in and near Franklin, including:
Specially Trained and Caring Team
John DeMastri
Center Director
Hello! I’m John Center Director at Mathnasium of Franklin. I’ve loved working with kids and supporting learning ever since my very first job in high school as a teacher’s assistant at a daycare. Today, I get to bring that same passion to the amazing students and families here in Franklin.
I studied Physics and Philosophy at Northeastern University in Boston, and one of my favorite parts of working at Mathnasium is helping students understand not just how to solve a problem, but why it matters. Watching a student’s confidence grow—and seeing math click in a deeper way—is the best part of what I do. That’s why I believe so strongly in the Mathnasium approach: it turns math from a struggle into something students can truly enjoy and feel proud of. Outside the center, you might find me at a local concert, playing chess, or relaxing with my dog and a good book.
Fun fact: Before joining Mathnasium, I worked at Fermilab researching how stars and galaxies age—so if your child loves space, we’ll have plenty to talk about!
John Osborne
Owner
Hi, my name is John Osborne, and I’m the Co-Owner of Mathnasium of Franklin. I first discovered Mathnasium as a parent—I enrolled my son, hoping it would help him build confidence in math. What I didn’t expect was how much he loved coming here. The reward system, the caring instructors, and the fun, game-based approach made math feel exciting instead of overwhelming. Seeing that transformation firsthand is what inspired me to become involved in Mathnasium and bring that same experience to more families in our community.
Outside the center, I work in finance. I’m a CFA charterholder with an MBA from the Kellogg School of Management, a BS in Business Administration (with a minor in Mandarin Chinese) from the University of Richmond, and a certificate in Quantitative Data Science in Finance from Stevens Institute of Technology. But the title I’m most proud of is “parent”—and I bring that perspective into every decision we make at Mathnasium.
Fun fact: I lived and worked in Shanghai for four years, and I love sharing stories about it with students who are curious about the world!
Debbie Franke
Lead instructor
Debby is our longest-serving instructor at Mathnasium of Franklin, and she brings a wealth of teaching experience, patience, and warmth to every session. She spent eight years teaching in both Milwaukee Public Schools and Germantown, and later tutored students at MSOE—giving her a deep understanding of how children learn and what helps them thrive in math.
Families love Debby for her steady, encouraging approach. She knows how to meet students right where they are, build their confidence, and celebrate every step forward. Her experience across different ages and learning styles makes her an invaluable part of our team and a trusted mentor for our students.
Fun facts: Debby plays fantasy football with her children and grandchildren, loves building Legos, and enjoys crocheting and gardening in her free time.
Hannah Carroll
Lead Instructor
Hannah has been an instructor at Mathnasium of Franklin for nearly three years, and we’re thrilled to have her back in the center during her break from the University of Wisconsin–Madison, where she’s studying Actuarial Science. Her strong math background, combined with her friendly and upbeat personality, makes her a natural fit for helping students grow their confidence and skills.
A Franklin native, Hannah has always had a special way of connecting with kids—whether she’s guiding them through a tricky concept or helping run our family events. Families appreciate her patience, warmth, and ability to make learning feel both supportive and fun.
Fun fact: In high school, Hannah was a standout athlete—in 2024, she earned the No. 16 seed in the Division 1 state tennis tournament in doubles. She and her partner won two matches before falling to the eventual state champions!
Ella Biesterfeld
Instructor
Ella is an 18-year-old instructor who brings a wonderful blend of patience, kindness, and positive energy to Mathnasium of Franklin. She currently attends Wisconsin Lutheran High School and plans to study psychology—a perfect fit for someone who naturally understands how to encourage students, ease their frustrations, and help them feel confident in their learning.
Ella connects especially well with younger students and those who may feel anxious about math. Her warm personality, steady approach, and genuine care help students feel comfortable and supported from the moment they sit down with her.
Fun facts: Ella’s favorite color is green ;-)
Mari
Instructor
Mari is a senior in high school who brings curiosity, patience, and a genuine love for learning to Mathnasium of Franklin. She plans to study astrophysics after graduation, and her passion for science shines through in the way she explains concepts and helps students see the “big picture” behind the math they’re learning.
Mari has a calm, encouraging style that helps students feel comfortable asking questions and working through challenges. Families appreciate how she makes math feel approachable and even exciting, especially for students who benefit from seeing how math connects to the real world.
Fun fact: Mari is fascinated by space and hopes to study the stars, galaxies, and the physics that govern our universe!
Grace Solie
Instructor
Grace is a 17-year-old instructor at Mathnasium of Franklin who brings focus, enthusiasm, and a strong work ethic to every session. She attends Wisconsin Lutheran High School and will be continuing her education at Bryant & Stratton, where she plans to study business and play college softball. Her drive and determination make her a wonderful role model for our students.
Grace is especially great at helping students set goals, stay motivated, and keep a positive attitude—even when the math gets challenging. Families appreciate her encouraging style and her ability to make learning feel both productive and fun.
Fun fact: Grace will be playing college softball at Bryant & Stratton!
Students can take 3 easy steps to enroll at Mathnasium.
All students begin their Mathnasium journey with a diagnostic assessment that pinpoints what they already know and what they still need to learn.
FAQ
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Schedule Free Assessment
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Contact Us
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7740 S. Lovers Lane Rd, #430
Franklin, WI 53132
| Call: | (414) 982-3717 |
| Email: | [email protected] |
Mon
3:30PM - 7:30PM
Tue
3:30PM - 7:30PM
Wed
3:30PM - 7:30PM
Thu
3:30PM - 7:30PM
Sat
10:00AM - 2:00PM
Mon
3:30PM - 7:30PM
Tue
3:30PM - 7:30PM
Wed
3:30PM - 7:30PM
Thu
3:30PM - 7:30PM
Sat
10:00AM - 2:00PM
| Mon: | 3:30PM - 7:30PM |
| Tue: | 3:30PM - 7:30PM |
| Wed: | 3:30PM - 7:30PM |
| Thu: | 3:30PM - 7:30PM |
| Sat: | 10:00AM - 2:00PM |
| Mon: | 3:30PM - 7:30PM |
| Tue: | 3:30PM - 7:30PM |
| Wed: | 3:30PM - 7:30PM |
| Thu: | 3:30PM - 7:30PM |
| Sat: | 10:00AM - 2:00PM |
(414) 982-3717
