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

  • Arianie Keeney


  • Elira Elshani


  • Marianne Butterline


  • Katrina Schmitt


  • Indira Bhupatiraju


  • Sharon Yee

    Assistant Director

  • Elsa Aviza-Oberg


  • Janet Keefe


Arianie Keeney


Arianie Keeney is a Communications and Marketing professional in Winchester, MA. Arianie began her career as a teacher with the Ministry of Education, Singapore prior to pursuing a career in journalism in the USA. Arianie has written on international affairs, politics, government, education, and culture, in the Greater New York City area, and worked in online, radio, and broadcast journalism, in Houston, Texas. Arianie has also lived in Dubai, United Arab Emirates for ten years, where she was a Communications, Marketing, and Engagement Director, managing organizational operations, community engagement, digital marketing, and events management within the Dubai Classical Music scene. Arianie’s third culture upbringing from Southeast Asia – Singapore, Thailand, and Indonesia, as well as extensive living around the world as a third culture child and adult shape her view of the world today. Arianie credits her education of the Singapore Math curriculum for instilling her children with a strong foundation of Mathematics. Certified Teacher, Ministry of Education, Singapore. Master of Art in Diplomacy, International Conflict Resolution Norwich University – Graduated with Magna Cum Laude. Bachelor of Science in Political Science University of Houston – Graduated with Magna Cum Laude. Bachelor of Art in Communications, Broadcast Journalism, Photography, Film & Digital Media University of Houston – Graduated with Magna Cum Laude. Diploma in Education, English Literature, Art Theory, Digital Media Nanyang Technological University, National Institute of Education, Singapore – Graduated with Distinction. Arianie is the recipient of the Texas Association of Broadcasters Belo Corporation Scholarship 2003/2004, the George Kirksey Scholarship 2002/2003/2004, the Houston Press Club Scholarship 2003/2004, the Maxine Mesinger Houston Chronicle Scholarship 2002/2003 and a member of the Golden Key International Honour Society and the Phi Beta Delta International Scholar Honor Society.

Elira Elshani


Meet Elira, who holds a Bachelor’s degree in Mathematics and Computer Science from Massachusetts Institute of Technology (MIT). With a strong foundation in both mathematical theory and cutting-edge computer science, Elira currently thrives in the dynamic world of technology. Beyond her tech career, she also dedicates her time to educating and inspiring the next generation of mathematical minds as a part-time math teacher.

Marianne Butterline


Marianne Butterline earned her Bachelor of Science degree in Computer Science from Rutgers University. She worked as a software engineer and quality assurance analyst in the computer industry for nearly 20 years. Recognizing the important role technology could play in education, Marianne pursued her Master’s degree in Technology in Education at Lesley University. She is licensed as an Instructional Technology Specialist and teacher of Elementary and Middle School Mathematics, and has taught in Massachusetts public schools for 18 years. Marianne is passionate about building resilience in all learners, but especially in those who struggle, by encouraging the perseverance that leads to confidence and mastery.

Katrina Schmitt


Katrina Schmitt is from Massachusetts and received her bachelor’s degree in Computer Engineering from Villanova University. After working in software, she decided to pursue her passion to become a teacher and received her master’s degree in Elementary Education from Bridgewater State University. Katrina recently moved back to the area from Louisiana and now teaches first grade for the Haverhill Public Schools. She believes in making math accessible to all students, and helping children figure out the why and the how behind math procedures. Katrina promotes collaboration and problem solving in the classroom and is a strong believer in the idea that children are each other’s best teachers.
In her free time, Katrina enjoys reading, cooking, and exploring nature with her dog, Finn.

Indira Bhupatiraju


Indira Bhupatiraju has a Master of Education in Middle School Mathematics from Lesley University in Cambridge, MA. Indira has worked in Elementary/Middle schools as an Instructional Assistant and as a Teacher for more than 12 years. She enjoyed working with both Elementary and Middle school students and she earned a DESE Certification for Elementary and Middle School Mathematics for teaching. She strongly believes that every student can excel in math given right support and guidance by the teacher and enjoys working with children. She is passionate to teach concepts, sets high expectations for students and encourages them to try hard. She is currently working as a Middle School Math Teacher.

Sharon Yee

Assistant Director

Sharon Yee followed her passion of teaching by enrolling and graduating from Lesley University with a Master in Education. Prior to that, she earned her Bachelor’s degree from Boston University, and a Master from Bentley College with a concentration in Accounting, Business Administration and Taxation. Sharon is a Mass certified teacher in Elementary Education 1 – 6, Moderate Special Education K-8, and Middle School Math 5 – 8. She currently teaches 7th and 8th grade math. Sharon believes that a student-centered philosophy is where students learn best, when students’ needs guide the teaching approach, and the teacher acts as a facilitator. She lives in Newton and enjoys traveling, walking, playing the piano, and “fiddling” with the violin in her free time.

Elsa Aviza-Oberg


Elsa Aviza-Oberg has taught exclusively elementary mathematics for the past 10 years. She has led professional development for teachers in Waltham Public Schools and coached teachers in math content. She facilitates a coding and mathematics program developed at the Education Development Corporation through a partnership with the Waltham Public Schools.

A Phi Beta Kappa, magna cum laude graduate from George Washington University, Elsa earned a Masters’ Degree from Northeastern University. She is a strong believer in the importance of early math education for children, especially deep conceptual understanding that helps children succeed in algebra and higher level mathematics.

Janet Keefe


​Janet Keefe has been teaching with LSS since 2018. She holds a Bachelors in Mathematics & Education from Assumption College, now University. She has a diverse background teaching children of all ages from Grades 1 to 12, while specializing in Grade 7.

During her college years, she worked at Nelson Place Elementary School in Worcester, MA as a TA aiding Elementary classes in all settings, including children with ABA, Autism, and Non-Verbal learning challenges. Janet likes to make the classroom a fun experience, even during virtual learning, by engaging students to show their work, working as a team, and on occasion playing Jeopardy!

She currently works in the Hospitality Industry. When she has free time, Janet enjoys skiing and snowboarding during the winter months.  Janet is currently attending Graduate School at one of the best, Babson College, in Wellesley, MA and will graduate with her Babson MBA in Dec. 2023. She has big plans for her future as an Entrepreneur!

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.

Acton MA

271 Great Rd,
Suite 26,
Acton, MA 01720.
United States.