N. Karanam
We are very happy with my son’s progress and confidence after joining Mathnasium. I can clearly see improvemen...
See more reviews here




N. Karanam
We are very happy with my son’s progress and confidence after joining Mathnasium. I can clearly see improvemen...
See more reviews here
Mathnasium of Desert Ridge's personalized geometry tutoring programs are designed to support students at every stage of their math journey.
We can introduce and guide middle school students through foundational concepts like angles, shapes, congruence, and basic measurement, building the spatial reasoning and logical thinking skills needed for high school geometry.
Our tutors follow personalized learning plans to help students master high-school-level geometry topics—triangles, circles, proofs, transformations, and the Pythagorean theorem. We make abstract concepts clear and manageable.
Honors students and competition participants can receive targeted support for challenging topics like advanced proofs, coordinate geometry, and complex problem-solving strategies that prepare them for college-level coursework and math competitions.
Our specially trained math tutors support students of all skill levels excel in geometry, whether they’re just starting out with basic geometric principles like lines and intersections, or working through complex theorems and coordinate geometry.
We provide personalized instruction in an engaging and empowering environment, guiding students step by step through the concepts they need to master and building their confidence in the subject.
At Mathnasium, we use the Mathnasium Method™, our proprietary teaching approach based on personalized learning plans and interactive teaching techniques. This proven approach is designed to make even the most abstract geometric concepts easy to understand and apply to everyday concepts.
We build upon what students already know, strengthening foundational skills and introducing geometry concepts in sequence, so they can truly understand and even enjoy the subject.
Each student begins with a diagnostic assessment where we identify their current skill level, detect any gaps in understanding, and map out their learning goals. Using these insights, we create a personalized learning plan that guides them toward mastery of geometry.
Our tutors follow each student’s personalized learning plan while using proven, interactive teaching techniques. That way, students build a deep understanding of all important geometry concepts, including angles, transformations, congruence, and similarity.
Our 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.
Geometry Tutors Near You
We specialize in math-only instruction with a customized and fun learning approach that delivers results. We proudly serve communities in Desert Ridge, including:
Specially Trained and Caring Team
Betsy Washburn
Owner and Center Director
Betsy holds a Bachelor’s in Business Management from Arizona State University and a Master’s in Curriculum and Instruction from Western Governor’s University. She earned her teaching certificate in Southeast Missouri and taught junior high and high school math for 11 years.
Her experience as Center Director at Mathnasium of Blue Valley in Kansas fueled her passion for the Mathnasium Method™ and helping students make sense of math. Betsy returned to Phoenix in 2018 to be near her family. She has two married children, 1 granddaughter, Athena, and is excited to welcome her first grandson, Grayson, in 2026. Betsy enjoys reading, traveling, and spending time with family.
Tammie Yoakum
Owner
Tammie grew up in Glendale alongside her sister and co-owner, Betsy. Before joining Mathnasium full-time, she spent 30 years in the premium finance industry, building a strong career in business management and client support.
Her favorite part of Mathnasium is seeing students experience “aha” moments and grow in confidence. Tammie loves being part of a positive, student-focused environment where math truly makes sense. Outside of work, she enjoys spending time with family and friends, as well as music, movies, reading, and traveling.
Maxwell Tewelis
Assistant Center Director
Maxwell is a graduate of Northern Arizona University with degrees in mathematics, chemistry, and criminology. He has always been fascinated by math’s versatility and the unique ways students approach problem-solving.
He enjoys fostering a positive learning environment and helping students develop strong skills and confidence. Outside of Mathnasium, Maxwell enjoys caring for his younger brother, reading, watching movies, and spending time with friends.
Aliya Carrera
Assistant Center Director
Aliya is a Pinnacle High School graduate and has been part of the Mathnasium family for nearly six years. Her experience as both a student and team member has given her a deep appreciation for the Mathnasium Method™.
She enjoys supporting students, whether they need extra help or want to get ahead. Aliya loves connecting with families and creating a welcoming atmosphere. In her free time, she enjoys listening to music, spending time with her sister and her cat, and learning new skills.
Noel Hester
Lead Instructor
Hello, I'm Noel. I have studied physics and math at ASU. I have a deep passion for learning and helping students achieve their best! In my free time. I like to write music and meditate outside.
Monika Mattick
Lead Instructor - Online and Homeschool
Hi! I’m Monika Mattick. I have an Elementary Education degree (math emphasis) from GCU. I served for 5 years as a private math and language arts tutor in Southern California, then moved to Fountain Hills, Arizona in October 2023 with my husband, Adam. My greatest passion within education is not in the traditional classroom, but rather one-on-one tutoring. Especially math! Students have said I get way too excited for math time! My goal is to inspire your students to love math just as much! Having been homeschooled from 3rd grade through my senior year of highchool, I have a particularly deep passion for the homeschooled kids of Mathnasium. In my free time, I love to bake, do artsy projects, and spend time with family!
Rijul Gupta
Lead Instructor
Hello, my name is Rijul Gupta and I am a sophomore at Shadow Mountain High School. Ever since I was little, math has been my favorite subject and I look forward to it everyday. Before working at Mathnasium, I used to be a student here. In my free time, I play tennis and love to hangout with my family.
Whether they would like to attend sessions in-center or online, 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 the geometry concepts they still need to learn.
FAQ
Mathnasium of Desert Ridge is located on High Street, adjacent to Desert Ridge Marketplace, next door to Murphy Orthodontics, and across the street from Soda Jerk. High Street offers family-friendly restaurants and shopping, making it a convenient stop for busy families.
Students can attend sessions in person or join live, face-to-face online geometry tutoring with our caring tutors in Desert Ridge.
We proudly serve students from across North Phoenix, including families in Desert View Village, Aviano, Mountaingate, Sky Crossing, and Pepper Ridge. Local schools include:
Explorer Middle School
Pinnacle High School
Yes! We support students in both middle and high school, including those enrolled in standard, honors, or advanced geometry courses.
Our specially trained tutors help students understand all geometry topics they might come across, including:
Angles, triangles, and plane figures
Circles, polygons, and their properties
Congruence, similarity, and geometric reasoning
Transformations: reflections, rotations, translations, and dilations
Coordinate geometry: distance, midpoint, and slope
Volume and surface area of 3D shapes
Logic and proof writing
These topics are woven into each student's personalized learning plan and tailored to their exact needs.
At Mathnasium of Desert Ridge, we teach geometry using the Mathnasium Method™, a proprietary teaching approach that begins with a diagnostic assessment to understand each student's foundational skills, identify gaps, and clarify their goals.
Those insights shape a personalized learning plan that our specially trained tutors follow during every face-to-face session, in-center or online, combining visual, verbal, mental, tactile, and written strategies to help students truly understand the geometry they are working with.
Many students come to us confused or frustrated with geometry. To help them transform their relationship with the subject, we meet them where they are on their math journey, break down complex concepts into manageable steps, and provide ongoing guidance at their pace.
Our caring tutors focus on building both skills and confidence, so students feel supported and capable.
Absolutely! For advanced students, we offer enrichment opportunities that include challenging proofs, multi-step problem solving, and real-world applications to deepen their geometric thinking.
Absolutely. At Mathnasium of Desert Ridge, time for homework is built into each session. Our tutors work through geometry assignments with students, using each problem as a chance to deepen understanding rather than simply complete the work.
Yes! We can align our geometry instruction with classroom goals or Arizona state standards to help students prepare for quizzes, unit tests, final exams, and state assessments. We also support students preparing for standardized tests like the SAT®.
Yes! Students can join live, face-to-face online sessions with our tutors in Desert Ridge and follow the same personalized learning plan as they would in the center.
We’re a math-only learning center focused on helping students truly understand and enjoy math. Using the Mathnasium Method™, we follow personalized learning plans and deliver instruction in a supportive, engaging environment, helping students build lasting confidence and skills.
Yes! While we follow personalized learning plans for each student, our tutors are familiar with Arizona math standards and the geometry expectations of local schools.
When appropriate, we can align instruction with what students are learning in the classroom.
The cost of math tutoring at Mathnasium of Desert Ridge depends on your student's individual learning plan and session schedule. Students usually attend a couple of sessions per week for a flat monthly membership fee.
For specific pricing information, please contact our center directly. We're happy to walk you through the options and find a plan that fits your student's goals and your family's needs.
Getting started is easy! Contact us or schedule a free assessment to begin.
Once we understand your student's skills and goals, we'll create a personalized learning plan and begin sessions, often within just a few days.
We are offering homeschool hours Monday - Thursday from 9a - 12p.
Schedule Free Assessment
Call today and schedule your free assessment and we will share how we are a perfect fit with ESA/...
Schedule Free Assessment
Mathnasium is an approved vendor for Empowerment Scholarship Account (ESA). Call today to schedu...
Contact Us
Mathnasium of Desert Ridge is now proud to be a PVUSD approved partner! Come and choose your math...
Contact UsKnowledge Hub
May 4, 2026
Sep 10, 2025
Oct 10, 2024
Jul 25, 2024
Jul 18, 2024
5355 E. High Street, #109
Phoenix, AZ 85054
| Call: | (602) 374-3445 |
| Text: | (833) 369-4077 |
| Email: | phoenixnorthridge @mathnasium.com |
Mon - Thu
1:00PM - 7:00PM
Fri
1:00PM - 5:00PM
Mon - Thu
10:00AM - 7:00PM
Fri
12:00PM - 5:00PM
Sat
CLOSED
Sun
CLOSED
| Mon - Thu: | 1:00PM - 7:00PM |
| Fri: | 1:00PM - 5:00PM |
| Mon - Thu: | 10:00AM - 7:00PM |
| Fri: | 12:00PM - 5:00PM |
| Sat: | CLOSED |
| Sun: | CLOSED |
Have questions? Contact us.