Welcome to mathnasium of 4S Ranch

Scheduling/cancelling classes are a breeze. Plenty of time slots available which makes things very convenient....


My son recently started to going to mathnesium class and he is improving Very fast im maths and gaining more c...

Kinjal Madhani

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Schedule Free Assessment

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4S Ranch

  • 10543 4S Commons Drive, #175
  • San Diego, CA 92127
  • Call (858) 312-8888

Hours of Operation

Instructional Hours

Mon 3 PM - 8 PM
Tues 3 PM - 8 PM
Wed 3 PM - 8 PM
Thurs 3 PM - 8 PM
Fri 3 PM - 7 PM
Sat 10 AM - 2 PM

Office Hours

1:30 PM - 9 PM
1:30 PM - 9 PM
1:30 PM - 9 PM
1:30 PM - 9 PM
1:30 PM - 8 PM
10 AM - 2PM
By Phone
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Hello. I’m Youngkun Weiss, proud Center Director of Mathnasium of 4S Ranch, your neighborhood math-only learning center. We help kids in grades K-12 understand math by teaching in a 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:

  • 4S Ranch
  • Rancho Bernardo
  • Del Sur Elementary
  • Design39
  • Monterey Ridge Elementary School
  • Stone Ranch Elementary School
  • Bernardo Heights Middle School

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

Karen Lossing
Karen earned a Bachelor’s degree in Marketing from Penn State and spent ten years in the business community. After staying at home with her kids, she earned her Texas Teaching certification and went on to teach third and fifth grades and Special Ed for seven years. In addition, she served on the Res(...)



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.

Find out how Mathnasium will work for your child

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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.

"Love the environment and consistent process for keeping the children progressing."

— J.W.

4S Ranch

10543 4S Commons Drive, #175

San Diego, CA 92127

United States

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