After School Singapore Math Classes

Small Group Classes based on the Singapore math curriculum

Balanced and Rigorous Curriculum

Why Singapore Math

We adopt a balanced math curriculum based on the Concrete-Pictorial-Abstract Singapore math pedagogy. Using strong visualization and modeling, we emphasize Logic Reasoning, Early Algebraic Thinking, and Problem Solving. Our goal is to establish a strong mathematical foundation in our students so that they would enjoy challenging math tasks.


Abstract concept is first introduced using physical, interactive concrete objects, e.g. counting objects


Students use visual representations of concrete objects to model problems, making them easier to comprehend


Students understand concepts at a symbolic level, e.g. using symbols for mathematical operations and algebra

Congratulations to our students on their fine achievement in the CML 2020-2021

Our Grade 4, 5, 6 and 9 teams are Regional Winners in the CML 2020-2021 competition season! Massachusetts is in Region 1, which is our New England region. It includes: CT, MA, ME, NH, VT, RI.

Why Parents and Students Like Our Program

Conceptual Understanding

It is not just about learning algorithms and procedures but understanding why they work.

Problem Solving

Being able to use the toolsets to solve novel multi-step problems you have not seen before.

Small Group Sizes

Group sizes are small to ensure individual attention and class participation.

Qualified Teachers

Caring and experienced teachers that encourage class discussion and support learning.

Find Out More About Our Program

Sign up for a FREE evaluation to see if our program is a good fit!

Lesson Structure

Each week’s lesson consists of two parts:

Foundational Math

Focus on conceptual understanding and procedural fluency. Topics are taught linearly and circled back the next year, promoting deeper understanding.

Problem Solving

Students are exposed to unfamiliar problems every week, requiring them to deeply comprehend the problems and organize to problem-solve.

For my son, the additional reinforcement of math principles that Singapore Math is so important for his memory, processing ability, and math confidence. Ms. Jean is a terrific teachers who my son both respects and genuinely enjoys learning from. I wish she was in his classroom every day!

– Parent of 2nd Grader

We like the small class size, and teachers providing feedback about my child when necessary especially when I can also help, CML problems and meets, the active involvement of the owner Kar Hwee, which has maintained and improved the quality of instruction over the years!

– Parent of 4th and 7th Graders

Love the practical application of math in the problems presented. It’s not just about learning how to compute a calculation, but how to think through what the word problem is asking and how to apply math (and which tools) to the solution.

– Parent of 6th Grader

Our Journey

Our program started in 2015 in our dining room. Over the years, we have build a strong team of teachers and have helped many students build strong mathematical foundation and learn to enjoy math.


In-Person and Remote Classes


Experienced Math Teachers


Happy Learning Students

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Our Teachers

  • Ruth Kim

    Teacher/Summer Coordinator

  • Chandan Keshkamat


  • Dandan Zhou


  • Rowena Jimenez


  • Jean S C Chong

    Early Education Specialist

  • Kevin Yan


  • Amma Bigbi


  • Rana Razi


Ruth Kim

Teacher/Summer Coordinator

Ruth Kim is from NYC and has been raising her 3 children in the Boston suburbs. As a parent and educator in the public schools, she is constantly studying ways to effectively influence a child’s development through positive challenges and high standards. She believes that hard work and effort, set within a foundation of trust and self-respect are essential components of learning. Ms. Kim was introduced to Singapore Math 10 years ago, during a time of research into various Mathematics programs. She particularly appreciated how Singapore Math validates and builds on the instinctive connection students make with Math concepts. Over the years, Ms. Kim has used Singapore Math skills when teaching her own children and with students who present with various learning profiles. Ms. Kim holds a Bachelor’s degree in English language & Literature from Gordon College and a Master of Education in Moderate Disabilities from Lesley University.

Chandan Keshkamat


Chandan received her Master of Science degree from Goa University, India with top honors and ranking 1st in her college. A devoted mother, teaching is her passion and she loves working with students at all grade levels. She holds Massachusetts Teacher’s License to teach students in Grade 5 to Grade 12 and has been working as Teacher/Substitute Teacher/Exceptional SAT tutor at both public and private organizations such as Neighborhood Charter School-Boston, High Expectations, LLC. Malden, Huntington Learning Center-Waltham and Tutor Doctor tutoring agency.

Dandan Zhou


Dandan Zhou was inspired by her wonderful and caring teachers who made her want to become an educator herself. She studied mathematics and secondary education at the University of Memphis. After receiving her B.S., she taught at a public school in TN before moving to Chengdu, China where she taught for a few years. She experienced first-hand the differences between mathematical education in China and the United States, and became interested in understanding effective teaching strategies and best practices around the world.

Such interests led her to study Applied Mathematic at Northeastern University for her Master’s degree where she completed an independent project analyzing how cultural differences between Chinese and American students affect their mathematical curriculum.  Dandan is certified with Tennessee Professional Teacher License 7-12 and Massachusetts Initial Teacher License 8-12, and currently teaches in a high school in Natick.

Rowena Jimenez


Rowena Jimenez received her MA in Urban Policy from Tufts University (focus on education issues). She has taught elementary level students since 2010, and is currently a 4th grade teacher in an Independent School in Boston. Prior to that, she worked as a certified Middle School Math teacher in public schools in Lowell Ma.
Founder and Executive Director of a literacy nonprofit that builds engaged learners and change agents in an underdeveloped nation, Ms Jimenez believes that meaningful knowledge is organic and students of any age learn excitedly and effectively about anything that is of consequence to them. The educator’s role is to facilitate learning by creating an environment that nurtures inquisitiveness and collaboration. She recently finished a 13-week professional development course offered at Harvard called: Teaching and Learning in a Maker-Centered Classroom as part of her nonprofit work in the Philippines. She currently supports teachers in the Philippines offering non traditional learning experiences online for children in poor communities there, including math that’s based on the Singapore math philosophy.

Jean S C Chong

Early Education Specialist

Jean S C Chong was born and educated in Singapore. She has 2 Associate Degrees, one in Business Studies and the other in Culinary Arts and Science. In addition, she also holds a certified degree in Montessori Early Childhood and Development issued by the American Montessori Society. She has been a teacher for preschool/kindergarten in the past 19 years and a Montessori teacher in the last 11 years of the 19 years. She is currently a Curriculum Director at Rockland Montessori Academy.

Kevin Yan


Kevin holds a Bachelor of Science in Psychology from UMASS Boston and is currently pursuing his Master of Education in Middle/Secondary Education at UMASS Boston. After receiving his B.S., he served with AmeriCorps in urban education services, prompting him to pursue a career in mathematics education as he personally witnessed a shortage of qualified teachers. From then on, Kevin taught and developed curriculum for various education programs and institutes within Boston, Greater Boston, and the South Shore. As a pedagogical preference, Kevin emphasizes visual learning techniques, responsive classroom approaches, and game-based learning to ensure that students are learning effectively. In his free time, Kevin enjoys comics, manga, and video games, and is a passionate UFC fan.

Amma Bigbi


Amma holds a Bachelor of Science in Elementary Education from Westfield State University and is currently pursuing her Master’s in Clinical Mental Health Counseling from Walden University. While completing her B.S., Amma serves as AmeriCorps member at the Community Music School of Springfield, where she got the opportunity to work with students of all ages for three years. Amma enjoys working with students of all ages and believes that learning should be fun and interactive. Last year Amma taught at KIPP Academy Lynn Elementary, and she is looking forward to her journey with Lexington Singapore School. As a hobby, Amma enjoys running, reading, and playing the drumset.

Rana Razi


Rana Razi has been teaching math at various schools for the past ten years. Prior to switching to the field of education she had worked as an engineer in the Boston area. Her goal is to make math a more enjoyable subject for students. Currently she is working at Boston Public Schools.


Bachelor of Science in Electrical Engineering from Boston University

Master of Arts in Teaching Mathematics grades (5-12) from Western Governors University

Teaching certification for teaching math grades 8-12 in Massachusetts and Oregon

Our Center

We are located right in Lexington Town Center, behind the Cary Memorial Library. Street and meter parking is available around the area and in the Town Municipal Parking Lot across the street.


19 Muzzey Street, Suite L40, Lexington MA 02421


Tel: 781-479-2331

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Lexington MA

19 Muzzey St,
Suite L40,
Lexington, MA 02421.
United States.