Math Tutoring in Fullerton, Grades 4–12
From 4th-grade math to AP Calculus, students learn why each idea works, so they can handle problems they have never seen. Small groups of up to six or one-on-one, at our Fullerton center or live on Zoom.
Math at IC Math & Science
The Right Math at Every Stage
Each stage has a few ideas that later math depends on. We make sure those are solid before moving on.
What Learning the Why Looks Like in Math
Most students can follow the steps. Fewer can explain why the steps work, and that is what they need when a problem looks new.
Grades 5–6
Dividing fractions
The how
“Keep, change, flip.”
The why
3 ÷ 1/4 asks how many quarters fit into 3. There are four in each whole, so the answer is 12. Flipping is a shortcut for that question, and a student who knows the question can check the shortcut.
Grades 7–9
Solving equations
The how
“Move the 5 to the other side and change its sign.”
The why
An equation says two amounts are equal. Subtracting 5 from both sides keeps them equal. A student who sees this can solve equations that look nothing like the ones on the worksheet.
Algebra 1 and beyond
Slope
The how
“Rise over run.”
The why
Slope is how much one quantity changes for each one-unit change in the other: dollars per hour, miles per gallon. That meaning carries all the way into calculus, where a derivative is a slope.
Math Placement in Fullerton-Area Schools
Every district sets its own placement rules, and they change from year to year. Here is how the districts our families come from decide, according to their own 2025–26 and 2026–27 documents. Always confirm the current year with your school counselor.
Two Ways to Learn
After the free reasoning assessment, we recommend the class type that fits your child’s goals.
In person or online
At our Fullerton center, or live on Zoom with any of our math teachers.
Fall, spring, and summer
Classes run from fall through spring, plus an 8-week summer intensive.
Missed a class?
Missed group classes can be made up with the Zoom recording. See our FAQ for details.
Your class schedule
Class times are shared after your consultation with a director.
Who Teaches Math
Here are some of our math teachers. After a free consultation, we recommend the class and the teacher that fit your child, at our Fullerton center or on Zoom. More than 70% of our teachers hold a master’s degree or higher.
Insung Whang
Director of Math · 13+ years of teaching · Math instructor at Cal State Fullerton · M.A. in Mathematics, Cal State Fullerton
John Sinclair
19+ years of teaching · Current high school AP Calculus teacher · B.S. in Mathematics, University of Houston
Sabrina Slapak
20+ years of teaching · Current high school math teacher · Adjunct professor at Belmont University · M.S. in Mathematics
Leon Kim
14+ years of teaching · M.S. in Mathematics, Cal State Long Beach
Patrick Rhee
17+ years of teaching · AMC and AIME competition prep · Ph.D. in Chemical Engineering, University of Michigan
Young In Kim
4+ years of teaching · B.S. in Statistics & Data Science, UC Santa Barbara
Gizela Grace Branchach
4+ years of teaching · B.S. in Biochemistry, Biola University (Magna Cum Laude)
2026 AP math results
What Families Say About Math
In the words of ICMS parents and students, from our Google reviews.
My son loves Mr. Whang’s math classes! He always tells me how funny Mr. Whang is and how much fun he has in class. High school is stressful enough, so it’s wonderful to see him enjoying math while actually learning and understanding the material.
Lilian Z. · Parent
They don’t just teach formulas, but they make sure students truly understand the concepts. The explanations are always clear, and they take time to answer every question thoroughly. … My daughter not only improved in grades but also developed a much more positive attitude toward math.
J. I. · Parent
From the outset, his teaching environment was welcoming and focused on understanding rather than memorization. … Thanks to his diligent and brilliant teaching, starting from the 5th grade onward, I’ve never worried about math, even as I went into the difficult math AP classes.
Ian C. · Student
Free Math Tools and Guides
Written by our teachers, free for every family.
Questions Parents Ask About Math
Have a question that is not here? Ask us during your free consultation.
What grades and math courses do you teach?
Grades 4 through 12: 4th- and 5th-grade math, Pre-Algebra, Algebra 1, Geometry, Algebra 2, and Precalculus (including honors, AP Precalculus, and Integrated Math I, II, and III), then AP Calculus AB and BC, AP Statistics, and Multivariable Calculus. We also prepare students for SAT Math and the AMC and AIME competitions.
How do I know if my child is ready for accelerated math or Algebra 1 in 8th grade?
It depends more on understanding than on grade level. A child who is ready can explain why the rules for fractions and negative numbers work, can turn a word problem into an equation, and does not need a new memorized procedure for every type of problem. Our free reasoning assessment shows where your child stands, and we will tell you honestly whether to accelerate now or build the foundation first.
Do you help students prepare for district math placement tests?
Yes. A placement test checks whether a student understands the math from earlier grades, so we prepare students by finding and filling those gaps and by previewing the course they are aiming for. Near the test, they practice under test-like timing. Every district uses different tests, dates, and cutoffs, so we also help families find out their own district’s rules early.
How is a class here different from a learning center or a worksheet program?
Many learning centers have each student work through an individual plan while instructors help several students at once. Our classes work differently. One teacher leads a small group of up to six through each idea, checks every student’s reasoning during the session, and stays with the same group through the term. Lessons follow either our own curriculum or your child’s school course, students in Preview Classes get homework, and parents get a monthly progress report.
Do you follow my child’s school curriculum?
It depends on the goal. In a Preview Class, students learn ahead of school with our own curriculum. In a Grade Maintenance Class, we follow your child’s school course closely: the same syllabus, homework, and test dates.
Where are you, and do you teach online?
Our center is at 2009 W Commonwealth Ave, Suite E, Fullerton, CA 92833. We are open Monday to Friday from 3 to 9 pm and Saturday from 9 am to 7 pm. Most of our younger students attend elementary and middle schools in and around Fullerton. More than 40% of our students learn live on Zoom, from nearby cities to other states and Canada.
How do we get started?
Book a free consultation, and a director will call you within one business day, in English or Korean. Your child then takes a free 30-minute reasoning assessment, and we recommend a class and level. Your child can try a class before you decide, and there are no long-term contracts.
From First Call to First Class
Three simple steps, with no obligation to enroll.
No long-term contracts. Enroll in the way that works for your family.
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